null  User manual
AT Command Set
Reference Guide
This document contains preliminary data
current as of publication date and is subject
to change without notice.
Literature Number: SPRA359A
June 1998
Printed on Recycled Paper
Running Title—Attribute Reference
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Copyright  1998, Texas Instruments Incorporated
ii
Preface
Read This First
About This Manual
This reference guide provides descriptions of the AT commands that are
needed to comunicate with modems using the Texas Instruments TMS320
modem chipsets and reference designs.
Escape Sequence Disclaimer
The Hayest escape sequence (+++) is intended for public use by customers
holding a license agreement with Hayes Microcomputer or those currently
seeking a license. TI software replaces the +++ with the time-independent
escape sequence (TIES) of +++AT or +++AT[cmd] with a time limit set by the
S12 register.
Trademarks
AT is a trademark of International Business Machines Corporation.
Excel, Microsoft, Windows, and Windows NT are registered trademarks of Microsoft Corporation.
Hayes is a trademark of Hayes Microcomputer Products Incorporated.
Plug-and-Play is a trademark of TeleVideo, Inc.
PostScript is a trademark of Adobe Systems Incorporated.
TELCO is a trademark of Telco Intercontinental Corporation.
TI is a trademark of Texas Instruments Incorporated.
TrueSpeech is a trademark of DSP Group, Inc.
VoiceView is a trademark of System Soft, Inc.
PRELIMINARY
iii
Contents
iv
AT Commands
The AT commands described in this book are the basic, extended, fax, voice,
DSVD, VoiceView, V.80, and help commands needed to communicate with the
modem in manual mode. The command set provides a comprehensive description of the modem syntax, command procedures, modem/DTE commands, response messages, and S register parameters.
Topic
Page
1.1
Command Format and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2
Command Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3
S Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.4
V.80 Embedded Command Support (optional) . . . . . . . . . . . . . . . . . . . . 22
1.5
Basic Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.6
Extended Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
1.7
Fax Class 1 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
1.8
Fax Class 2.0 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
1.9
Fax Class 2.0 Modem Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
1.10 Fax Class 2.0 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
1.11 Voice Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
1.12 Result Codes for Voice Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
1.13 DSVD Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
1.14 VoiceView Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
1.15 Event Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
1.16 Help Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
PRELIMINARY
1
Command Format and Procedures
1.1 Command Format and Procedures
The following sections outline the command rules and procedures for the modem.
1.1.1
Alpha Characters
Only the seven low-order bits of each character are significant to the modem;
eighth or higher-order bit(s) are ignored. Unless otherwise noted, lowercase
characters (values from 61h to 7Ah) and their uppercase equivalents (values
from 41h to 5Ah) have the same values when received by the modem from the
data terminal equipment (DTE) modem responses appear in uppercase.
1.1.2
DTE Command Conventions
DTE commands use the following conventions:
- In the command descriptions, words that are enclosed in <angle brackets>
refer to syntax elements, such as arguments, that are defined in the commands section of this chapter. When you see a word in angle brackets, you
specify the information within the brackets but you do not enter the brackets.
- Items that are enclosed in [square brackets] are optional and can be
omitted from the command line.
- Quotations (“...”) indicate that the preceding syntax element, a parameter
or value, can be repeated.
- Other characters (including ?, (,), &, and =) that can appear in syntax de-
scriptions must appear in the order shown.
2
PRELIMINARY
Command Format and Procedures
1.1.3
General Command-Line Format
A command line consists of three elements:
Prefix
consists of the ASCII characters AT or at, and must always be
preceded by a valid stop bit. This is so that if a modem disconnects unexpectedly, it does not misinterpret partial data as a
command. All command lines begin with AT, except A/, A>,
and +++. Entering AT clears the modem command buffer in
preparation to accept a new command line.
Body
must be at least 60 characters. Space characters (20h) are ignored and are used for formatting purposes. The body consists
of the individual commands described in sections 1.5 through
1.17.
Terminator
is a single character selected by a user-specified parameter
(S3 register). The default is the carriage return, <cr> (0Dh).
The terminator character may not appear in the body.
The general format of commands, except for the D and S commands, is as follows:
command <argument>
where command is a single character preceded by AT, followed by the command character(s). The < argument > can be a series of characters, ranging
from 0 through 9, representing a decimal integer value. If a command expects
an < argument > (such as another command or terminator) and it is missing,
a value of 0 is assumed. All leading 0s in the < argument > are ignored by the
modem. Additional commands may follow a basic format command (and associated parameter, if any) on the same command line, without any character
separator. Note that the results of some commands (such as A) cause the remainder of the command line to be ignored.
See the descriptions of the D command on page 29 and the S command on
page 43 for exceptions to the command-line general format.
1.1.4
Command-Line Editing
Command-line editing allows you to delete the previous character in the command line. An editing character is defined by a user-specified parameter (S5
register). The default edit character is the backspace, < bs > (08h).
The modem reads characters from the DTE to determine if they match the terminator (S3 register) first and then the editing character (S5 register) before
it checks other characters.
PRELIMINARY
AT Commands
3
Command Format and Procedures
Note: Echo
While in the command mode, the modem can echo characters received from
the DTE. If enabled, each character is echoed individually at the same data
rate, parity, and format as it was received.
1.1.5
Valid Values
Command identifiers are taken from the set of displayable ASCII characters
(21h through 7Eh). Single-character commands consist of alpha characters
A through Z (41h through 5Ah). Characters 61h through 7Ah are equivalent
because lowercase characters are considered the same as their uppercase
equivalents.
Note: Invalid Commands
The modem can ignore certain commands and continue to operate normally
if the modem and DTE interface are not affected by the execution of the command. The modem responds with an OK rather than an ERROR response
code.
1.1.6
Issuing Commands
All characters on a command line are issued at the same data rate, parity, and
format. There is at least a 10-ms lapse between receipt of the previous command’s entire response code and a subsequent command line. The modem
does not issue an unsolicited response code to the DTE during reception and
processing of a command line (between receipt of the first character of the prefix and issue of the last character of any response).
1.1.7
Executing Commands
Upon receipt of the terminator character, the modem executes commands in
the command line from left to right. Each command is executed individually,
regardless of what follows on the line. If all commands execute properly or if
no commands appear in the command line, a single OK response code is issued after executing the final command. If an unrecognizable character or an
invalid command is encountered or if any command results in an error, execution of the command line is terminated, an ERROR response is returned, and
all subsequent commands on the line are ignored. Commands in the line prior
to the error are executed.
4
PRELIMINARY
Command Format and Procedures
1.1.8
Command Execution Time
Commands execute instantaneously, unless otherwise specified. Commands
that execute immediately cannot be aborted. Some commands that require
more time to execute (such as dialing or answering a call) can be aborted while
in progress.
1.1.9
Aborting Commands
Commands that can be aborted are noted explicitly in the command description. Terminating commands is accomplished by transmitting any character
from the DTE to the modem. A single character is sufficient to stop a command
in progress. However, characters that are transmitted during the first 125 ms
of a command execution are ignored to allow the DTE time to append additional
control characters, such as a line feed after the command line terminator.
Sending the terminator character at the same rate as the preceding command
line ensures that the modem recognizes the abort; the modem may ignore
characters sent at other rates. When the modem recognizes an abort, it terminates the command in progress and returns an OK or NO CARRIER result
code to the DTE.
1.1.10 Modem Responses
In the command mode, the modem issues responses using the same data
rate, parity, and format as the most recently received DTE command line. In
the online mode, the modem issues responses using the current modem-to-DTE
data rate with parity equal to the most recently received DTE command. Response characters must be contiguous, with no more than two bit times of mark
idle issued between characters.
1.1.11 Basic Responses
The modem issues the following information responses and result codes.
Information Responses
Information responses consist of three parts:
- Headers
- Text lines
- Line terminators
The characters in the header are determined by a user-specified parameter
(see the V command on page 45). The text line and line terminator can be repeated for multiple line responses.
PRELIMINARY
AT Commands
5
Command Format and Procedures
Result Codes
A result code can be a number or a string, depending on a user-specified parameter (see the V command). The three types of result codes are:
Intermediate
result codes inform the DTE of the ongoing progress of an
action.
Final
result codes (such as OK, ERROR, NO CARRIER, and
others which are identified in the definition of the result
code) indicate that the modem has completed processing
the previous command(s), and is ready to receive a new
command.
Unsolicited
result codes (such as RING) indicate an event that is not
directly associated with a command from the DTE.
Result codes consist of four parts:
-
Header
Text
Line terminator
Trailer
The characters in the header and trailer are determined by a user-specified
parameter (see the V command on page 45). The line terminator is the contents of the S3 register [default is carriage return, < cr > (0Dh)].
There are 40 possible result codes. See the description of the X command on
page 46 for result code descriptions and their numeric equivalents. Each command description includes specific result codes and circumstances under
which they can be issued in relation to the command.
6
PRELIMINARY
Command Set Summary
1.2 Command Set Summary
Table 1–1 through Table 1–9 summarize the command set within the following
functional groups:
-
Basic commands (Table 1–1)
Extended commands (Table 1–2 on page 8)
Fax class 1 commands (Table 1–3 on page 9)
Fax class 2.0 commands (Table 1–4 on page 10)
Voice commands (Table 1–5 on page 12)
DSVD commands (optional) (Table 1–6 on page 13)
VoiceView commands (Table 1–7 on page 14)
Help commands (Table 1–8 on page 15)
Table 1–1. Basic Commands
Command†
Description
A/
Reexecute
24
A>
Reexecute continuously
25
AT
Command prefix
26
A
Answer
27
B
US/ITU-T answer sequence
28
D
Dial
29
E
Echo
32
F
Duplex
33
H
Off-hook
34
I
Inquiry
35
L
Volume
38
M
Speaker
39
O
Online
40
P
Pulse dial
41
Q
Quiet
42
S
S register
43
T
Tone dialing
44
Is discussed on page
† AT must precede all commands except A/, A>, and +++.
PRELIMINARY
AT Commands
7
Command Set Summary
Table 1–1. Basic Commands (Continued)
Command†
Description
V
Result code enable
45
X
Result code options
46
Y
Set default profile
56
Z
Reset
57
+++
Escape sequence
58
< any key >
Terminate current dial/answer operation
59
< Ctrl >S
Stop/restart help
60
< Ctrl >C
< Ctrl >K
Cancel help screens
61
Is discussed on page
† AT must precede all commands except A/, A>, and +++.
Table 1–2. Extended Commands
Command†
Description
&A
ARQ result codes enable
62
&B
DTE data rate
63
&C
Carrier detect
64
&D
Data terminal ready
65
&F
Load factory settings
66
&G
Guard tone
67
&H
Transmit flow control
68
&I
Receive software flow control
69
&K
Data compression
70
&M
Error control and synchronous operation
71
&N
DCE link rate
72
&P
Make/break ratio
75
&R
Receive data hardware flow control
76
Is discussed on page
† AT must precede all commands.
8
PRELIMINARY
Command Set Summary
Table 1–2. Extended Commands (Continued)
Command†
Description
Is discussed on page
&S
DSR options
77
&T
Diagnostic test
78
&U
DCE link rate floor
81
&W
Write to NVRAM
84
&Y
Break handling
85
&Z
Write dial string to NVRAM
86
† AT must precede all commands.
Table 1–3. Fax Class 1 Commands
Command†
Description
+FARX
Asynchronous receive
87
+FATX
Asynchronous transmit
88
+FCLASS
Set FCLASS
89
+FRH
Receive HDLC data with carrier
90
+FRM
Receive data with carrier
91
+FRS
Wait for silence
92
+FTH
Transmit HDLC data with carrier
93
+FTM
Transmit data with carrier
94
+FTS
Stop transmission and pause
95
Is discussed on page
† AT must precede all commands.
PRELIMINARY
AT Commands
9
Command Set Summary
Table 1–4. Fax Class 2.0 Commands
(a) Commands
Command†
Description
+FDR
Data reception
96
+FDT
Data transmission
97
+FIP
Initialize fax parameters
98
+FKS
Session termination
99
Is discussed on page
† AT must precede all commands.
(b) Responses
Response†
Description
+FCO
Fax connection
100
+FDM
Transition to data modem
101
+FCI
Report remote ID, CSI
102
+FCS
DCS frame information
103
+FIS
DIS frame information
104
+FNC
Report NSC frame
105
+FNF
Report NSF frame
106
+FNS
Report NSS frame
107
+FPI
Report remote ID, CIG
108
+FPO
Remote polling indication
109
+FTC
DTC frame information
110
+FTI
Report Remote ID, TSI
111
+FPS
T.30 phase C page reception
112
+FET
Post page message
113
Is discussed on page
† AT precedes all responses.
10
PRELIMINARY
Command Set Summary
Table 1–4. Fax Class 2.0 Commands (Continued)
(c) Parameters
Parameter†
Description
+FCLASS
Service class selection parameter
115
+FMI
Request manufacturer ID
116
+FMM
Request model ID
117
+FMR
Request modem revision
118
+FAA
Adaptive answer
119
+FCC
Modem capabilities
120
+FCQ
Copy quality checking
121
+FCR
Capability to receive
122
+FCS
Current session parameters
123
+FCT
DTE phase C time-out
124
+FHS
Call termination status
125
+FIS
Current session negotiating position
128
+FLI
Local ID
129
+FLP
Indicate document to poll
130
+FMS
Minimum phase C speed
131
+FNR
Negotiations message reporting
132
+FNS
Nonstandard frame FIF parameter
133
+FPI
Local polling ID
134
+FSP
Request to poll
135
+FBO
Data bit order
136
+FBS
Buffer size
137
+FEA
Phase C received EOL alignment
138
+FLO
Flow control selection
139
+FPP
Packet protocol selection
140
+FPR
Serial port rate selection
141
Is discussed on page
† AT must precede all parameters.
PRELIMINARY
AT Commands
11
Command Set Summary
Table 1–5. Voice Commands
Command†
Description
#BDR
Select baud rate (turn off autobaud)
142
#CID
Enable caller ID
143
#CLS
Select data, fax or voice
144
#MFR?
Identify manufacturer of modem
145
#REV?
Identify supervisor code revision level of modem
146
#VBQ
Query buffer size
147
#VBS
Bits per sample (compression factor)
148
#VBT
Beep tone timer
149
#VCI?
Identify compression method
150
#VGR
Select voice receive gain
151
#VGT
Select voice transmit gain
152
#VLS
Voice line select
153
#VRA
Ringback goes away timer
154
#VRN
Ringback never came timer
155
#VRX
Voice receive
156
#VSD
Enable silence deletion
157
#VSK
Buffer skid setting
158
#VSM
Select compression method and sampling rate
159
#VSP
Silence detection period
160
#VSR
Sampling rate selection
161
#VSS
Silence detection tuner
162
#VTD
DTMF tone reporting
163
#VTS
Generate tone signals
164
#VTX
Voice transmit
165
Is discussed on page
† AT must precede all commands.
12
PRELIMINARY
Command Set Summary
Table 1–6. DSVD Commands (optional)
Command†
Description
–SAD
Set the number of audio packet delay
167
–SAT
Select audio device
168
–SHG
Select handset input gain
169
–SHV
Select handset volume
170
–SMG
Select microphone gain
171
–SPH?
Query auxiliary phone hook status
172
–SSA
Select audio compression algorithm
173
–SSE
Enable/disable DSVD
174
–SSN
Disable/enable sequence numbers for audio packets
175
–SSV
Select speaker volume
176
Is discussed on page
† AT must precede all commands.
PRELIMINARY
AT Commands
13
Command Set Summary
Table 1–7. VoiceView Commands
Command†
Description
+FCLASS
Mode selection
177
+FLO
Flow control
178
+FMI?
Identify DCE manufacturer
179
+FMM?
Identify DCE model
180
+FMR?
Identify DCE revision
181
+FPR
Select DTE/DCE interface rate
182
–SCD
Capabilities data
183
–SDA
Originate action control
184
–SDR
Modem data mode response control
185
–SDT
Date
186
–SEM
Erase message
187
–SER?
Error status
188
–SEV
Event message suppression
189
–SFR
Fax data mode response control
190
–SIC
Reset capabilities data to default setting
191
–SIP
Initialize VoiceView parameters
192
–SKA
Keep alive timer
193
–SMT
Telephone handset mute control
194
–SOR
Reject or overflow system messages
195
–SQR
Capabilities query response control
196
–SRG
Ring generation count
197
–SRJ
Reject data mode request
198
–SRM
Retrieve message
199
–SSP
Set VoiceView transmission speeds
200
–SSQ
Start capabilities query
201
–STM
Time
202
Is discussed on page
† AT must precede all commands.
14
PRELIMINARY
Command Set Summary
Table 1–7. VoiceView Commands (Continued)
Command†
Description
–STT
Telephone handset transaction tone control
203
–SVR
VoiceView data mode response control
204
Is discussed on page
† AT must precede all commands.
Table 1–8. Help Commands
Command†
Description
$
Basic
208
&$
Extended ampersand
209
D$
Dial
210
Sn?
S register contents
211
S$
S register description
212
Is discussed on page
† AT must precede all commands.
PRELIMINARY
AT Commands
15
S Register Summary
1.3 S Register Summary
The S Registers are memory-mapped registers that allow you to set and store
the modem’s operationg parameters. Table 1–9 summarizes the S registers.
Table 1–9. S Registers
S Register
Description
S0
Sets the number of rings on which to answer when modem is set to auto answer mode
(default = 1).
S1
Stores the number of rings received (default = 0)
S2
Stores the ASCII decimal code for the escape code (+) character (default = 43)
S3
Stores the ASCII decimal code for the carriage return < cr > character (default = 13)
S4
Stores the ASCII decimal code for the line feed < lf > character (default = 10)
S5
Stores the ASCII decimal code for the backspace character < bs > (default = 8)
S6
Contains the time (number of seconds) that the modem waits before executing a dial string
(default = 2)
S7
Stores the time (in seconds) that the modem waits to receive a carrier signal after executing a dial
string or answering before returning on-hook and sending a NO CARRIER response code to the
DTE (default = 60)
S8
Stores the time (in seconds) for the pause option (,) in the dial command
S9
Stores the time (in tenths of a second) that the modem waits to receive a carrier signal before
recognizing a valid connection (default = 6). Note that the modem ignores settings greater than
2400 bps due to the length of handshaking sequences.
S10
Stores the time (in tenths of a second) that the modem waits after the loss of a carrier before disconnecting (default = 7)
S11
Stores the duration and spacing (in milliseconds) of dialed touch tones (default = 70)
S12
Stores the duration (in fiftieths of a second) for the guard time of the escape sequence (default
= 50)
S13
Options register (default = 0). Bit-mapped options are selected/deselected by the binary representation of the following decimal values:
16
1
Resets the modem when the DTR is not asserted
2
Resets the non-MNP transmit buffer from 1.5K bytes to 128 bytes
4
Sets the backspace key to delete
8
Autodials the number stored in NVRAM location 0 when the DTR is asserted
PRELIMINARY
S Register Summary
Table 1–9. S Registers (Continued)
S Register
Description
S13 (contin- 16
ued)
Autodials the number stored in NVRAM location 0 if the software is reset or when the
modem is powered up
32
Disables V.32bis ASL mode
64
Disables quick retrains
128
Disconnects on the escape code
S14
Reserved
S15
Contains the ARQ options register (default = 0). Bit-mapped options are selected/deselected by
the binary representation of the following decimal values:
1
Disables ARQ/MNP for V.22
2
Disables ARQ/MNP for V.22bis
4
Disables ARQ/MNP for V.32/V.32bis/V.32terbo
8
Disables MNP handshake
16
Disables MNP level 4
32
Disables MNP level 3
64
MNP incompatibility. When S15 = 64, it performs the following:
128
S16
-
Increases time allowed to establish connection with some modem manufacturers’
products by 1 second
-
Changes MNP link identifier from a Texas Instruments standard to generic for
compatibility with some modem manufacturers’ products
-
Eliminates remote end echo; this prevents connecting to itself if the remote DCE
echoes the MNP link request
-
Changes the delay of some control characters for compatibility with some modem manufacturers’ products
Disables V.42 operation
Contains the test mode (default = 0) settings as follows:
1
Reserved
2
Dial test. When a touch-tone digit is entered from the DTE in a dial string, the tone
continues until a carriage return character from the DTE aborts it (for testing purposes).
PRELIMINARY
AT Commands
17
S Register Summary
Table 1–9. S Registers (Continued)
S Register
Description
S16
4
Test pattern generation. A test pattern is generated by the modem and sent out over
the phone link. Pressing any key terminates this function.
8–128
Reserved
S17
Reserved
S18
Stores the time (in seconds) for the diagnostics test mode, &T. A value of 0 disables the timer;
a value of 1–255 is acceptable (default = 0).
S19
Stores the duration (in minutes) for the inactivity timer. If the modem senses no data transmission
for a period of time exceeding the nonzero value in this register, it disconnects the call. A value
of 0 disables the function (default = 0). All other values enable it.
S20
Reserved
S21
Stores the lengths (in 10-ms increments) of break characters sent from the modem to the DTE
(default = 10). This is used in MNP or V.42 mode only.
S22
Stores the ASCII decimal code for the XON character (default = 17)
S23
Stores the ASCII decimal code for the XOFF character (default = 19)
S24
Reserved
S25
Contains the DTR recognition time (in hundredths of a second, default = 20)
S26
Reserved
S27
Connects bit-mapped operations. Contains various modulation and error correction control flags
(default = 0).
18
1
V.21/Bell 103 mode select (default = Bell 103)
2
Enables unencoded modulation in V.32 mode
4
Disables V.32 modulation
8
Disables 2100-Hz answer tone
16
Enables V.23 fallback mode
32
Disables V.32bis mode
64
Reserved
128
Software compatibility mode. All connect messages equal to or greater than
9600 bps are expressed as CONNECT 9600.
PRELIMINARY
S Register Summary
Table 1–9. S Registers (Continued)
S Register
Description
S28
V.32 handshaking time (0–25.5 seconds)
0
Eliminates the V.32 answer tones for faster connection
8
Default time. All times are in tenths of a second.
255
Disables all connections, except V.32 9600 bps
S29
V.21 answer mode fallback timer (in one-tenth-second intervals, default = 20)
S30
VoiceView deadman timer function (default = 0) (voice modems only)
S31
TAD audio level adjust (default = 128)
S32
Connects bit-mapped operations. Contains various modulation and call control flags (default = 2)
S33
1
V.8 call indicate enable
2
Enables V.8 mode (default)
4
Disables V.FC modulation
8
Disables V.34 modulation
16
Disables V.34+ modulation (Note: some modem references show reserved)
34
Enables V.90, disables x2
66
Enables x2, disables V.90
V.34 & V.34+ connection-setup bit-mapped control flags (default = 0)
1
Disables 2400 symbol rate
2
Disables 2743 symbol rate
4
Disables 2800 symbol rate
8
Disables 3000 symbol rate
16
Disables 3200 symbol rate
32
Disables 3429 symbol rate
64
Reserved
128
Disables shaping
PRELIMINARY
AT Commands
19
S Register Summary
Table 1–9. S Registers (Continued)
S Register
Description
S34
V.34 & V.34+ connection-setup bit-mapped control flags (default = 0)
1
Disables 8S-2D trellis encoding
2
Disables 16S-4D trellis encoding
4
Disables 32S-2D trellis encoding
8
Disables 64S-4D trellis encoding
16
Disables nonlinear coding
32
Disables TX level deviation
64
Disables preemphasis
128
Disables precoding
S35 – S37
Reserved
S38
When the DTR drops during an ARQ call, this register sets up an optional delay (in seconds) before the modem is forced to hang up and clear the transmit buffer. This allows time for a remote
modem to acknowledge receipt of all transmitted data before it is disconnected (default = 0). The
modem immediately hangs up when the DTR drops.
S39
Reserved for international usage
S40
Reserved for international usage
S41
Bit mapped (default = 0)
Bit 0: enables/disables distinctive ring
Bits 1–2: (voice only)
00 = full-duplex speaker phone mode
01 = half-duplex speaker phone mode
Bit 3: message waiting
Bits 4–7: reserved
20
PRELIMINARY
S Register Summary
Table 1–9. S Registers (Continued)
S Register
Description
S42
Bit mapped (default = 0)
Bits 0–2: GPI definition (Macintosh only):
000 = not active
001 = CD signal
010 = RI signal
011 = DSR signal
100 = ARQ signal
101 = undefined
110 = undefined
111 = undefined
Bits 3–7: reserved
PRELIMINARY
AT Commands
21
V.80 Embedded Command Support (optional)
1.4 V.80 Embedded Command Support (optional)
Table 1–10 is a list of the supported embedded commands. All embedded
commands are available while the modem is in the online mode only. Any embedded command transmitted while the modem is not connected and online
is ignored. All embedded commands have an 8-bit format. In the case of 7-bit
commands, the eighth bit must be 0.
1.4.1
General Command Line Format
An embedded command line is made up of two elements: the prefix and the
body. The command line prefix consists of the in and escape character, EM,
which is the ASCII character “^Y” (Ctrl–Y), 19H or 99H. The body is made up
of an individual command and all associated parameters. The command character itself always follows the command prefix. All extended commands contain a length indicator and a parameter body. The size of this body is determined by value of the length field. The modem is capable of accepting 95 characters in the body.
1.4.2
Executing Commands
Upon reception of the last command character, the modem executes of the
command. If a character is not recognized as a valid command or execution
of any command results in an error, execution of the command line is terminated at that point and all subsequent data on the line is ignored.
22
PRELIMINARY
V.80 Embedded Command Support (optional)
1.4.3
List of Embedded Commands
Table 1–10 lists the embedded commands. All the commands listed are preceded by a shield character (Ctrl–Y).
Table 1–10. V.80 Embedded Commands
Command
(Hexadecimal)
Description
Command
(Hexadecimal) Description
2A†
TX audio packet
AD
TX/RX 13h, 19h pattern
2D†
TX data packet
AE
TX/RX 13h, 99h pattern
3A†
RX audio packet
AF
TX/RX 13h, 11h pattern
3D†
RX data packet
B0
TX: begin transparent mode
RX: HDLC frame abort detected
42
RTS off
43
RTS on
44
DTR off
45
DTR on
5C
TX/RX one shield character
5D
TX/RX two shield characters
62
CTS off
63
CTS on
B3
TX: RX enter frame hunt mode
76
TX/RX one 99h character
B4
RX: transmit underrun
77
TX/RX two 99h characters
B5
RX: transmit data overrun
A0
TX/RX 11h character (XON)
B6
RX: receive data overrun
A1
TX/RX 13h character (XOFF)
BA
TX: terminate carrier
A2
TX/RX two 11h characters (XON)
A3
TX/RX two 13h characters (XOFF)
BB
TX: enter online command state
A4
TX/RX 19h, 99h pattern
BC
TX: request rate negotiation
A5
TX/RX 19h, 11h pattern
A7
TX/RX 99h, 19h pattern
A8
TX/RX 99h, 11h pattern
A9
TX/RX 99h, 13h pattern
AA
TX/RX 11h, 19h pattern
AB
TX/RX 11h, 99h pattern
AC
TX/RX 11h, 13h pattern
B1
TX: start frame mode or
end
d currentt fframe
RX: end of frame detected
CRC valid
lid if DCE checked
h k d
B2
TX: transmit abort
RX: end of frame error
RX: carrier lost
RX: rate negotiation requested
BD
TX: request retrain
RX: retrain requested
BE
TX: set maximum rate
RX: rate
ate negotiation/retrain
egot at o / et a
complete
indicate new rate
† Operating system independent internal data/fax/voice modem only.
PRELIMINARY
AT Commands
23
A/ (Reexecute) Basic Commands
1.5 Basic Commands
The following sections list and describe the basic commands necessary to
communicate manually with the modem.
Command Syntax
A/
Description
Reexecutes the last command that was executed. This command does not require the AT prefix or a carriage return.
Arguments
None
Aborting Events
None
24
PRELIMINARY
Basic Commands
A> (Reexecute Continuosly)
Command Syntax
A>
Description
Continuously reexecutes the last command that was executed. The S6 register value is used as a delay between reexecutions. This command does not
require the AT prefix or a carriage return.
Arguments
None
Aborting Events
Any key pressed during the execution delay period terminates the operation.
PRELIMINARY
AT Commands
25
AT (Command Prefix) Basic Commands
Command Syntax
AT <command>
Description
The prefix to modem commands. It can be typed in lowercase or uppercase,
but not mixed case. AT must precede all commands except the A/, +++, and
A> commands. All characters preceding AT are ignored. Entering AT notifies
the modem to clear the previous command buffer in preparation for accepting
a new command. All characters that follow AT are treated as commands until
a line terminator character (stored in the S3 register) is received.
Arguments
None
Aborting Events
None
Other
In order for the modem to accept the AT prefix, there must be 1 ms of inactivity
preceding the command on the DTE TD line.
26
PRELIMINARY
Basic Commands
A (Answer)
Command Syntax
ATA
Description
Executes the answer sequence. The modem goes off hook, waits for billing
delay time, then sends an answer tone and initiates a handshake sequence.
Arguments
None
DTE Interface
The DSR is asserted after the modem goes off hook if the following are true:
- The modem is not in test mode (following ITU-T V.22bis recommendation,
self-test section).
- AT&S0 is not in test mode (see page 77).
Aborting Events
Any key pressed during the answer sequence aborts the command and returns the modem to the command mode.
- DTR is low if AT&D (see page 65) is not equal to 1 after abort action.
- DTR is low when the time stored in S7 register expires.
Other
PRELIMINARY
The speaker is activated when the modem goes off hook, as set by the ATM
command (see page 39). Any other commands that follow ATA are ignored.
AT Commands
27
B (US/ITU-T Answer Sequence) Basic Commands
Command Syntax
ATB <argument>
Description
Selects between the US answer sequence (2225 Hz) and ITU-T answer sequence (2100 Hz and 2250 Hz).
Arguments
0 or 1
0
ITU-T V.25 answer sequence. Also answers calls originating outside the
US or Canada (default)
1
Bell answer tone
Aborting Events
None
Other
ATB0 is required to activate the AT&G1 and AT&G2 commands (see page 67).
28
PRELIMINARY
Basic Commands
D (Dial)
Command Syntax
ATD <argument>
Description
The modem goes off hook and enters the originate mode (unless the R argument is used). It then waits the specified time (number of seconds stored in the
S6 register) if the ATX command (see page 46) is set to 0, 1, 3, or 5, and dials
the string that follows. The modem establishes a data connection and goes
into a data mode (or command mode if using the “;” argument) or fails to establish a data connection and reverts to the command mode. Call progress response codes (if any) are received by the DTE (see the ATQ command on
page 42, the ATV command on page 45, and the ATX command on page 46).
Arguments
The following arguments are available:
0–9 Numeric digits
PRELIMINARY
#,*
Extended DTMF tones
,
Pause. The modem pauses for a number of seconds (stored in the S8
register) before executing the following commands or arguments in the
dial string.
;
Returns to the command mode after dialing is completed
!
Flash switch hook. The modem goes off hook for 0.5 seconds, goes on
hook for 0.5 seconds, then goes off hook again. This command transfers
calls to another extension.
T
Touch tone dialing. The S11 register sets the duration and spacing of
touch tones.
P
Pulse dialing. The modem pulse dials using the AT&P command (see
page 75).
@
Waiting for an answer. The modem dials a string. If it detects at least one
ring signal, it waits for a specified time (stored in the S7 register) listening
for 5 seconds of silence. It then executes the rest of the dial string that
follows the @ command. This command is functional only when the ATX
command is set to 3, 4, 5, or 6 (see page 46).
R
Reverse frequencies. The modem reverses the originate and answer frequencies so that it originates in answer mode.
Sn
The modem dials the string found in NVRAM location n (n = 0–3).
“
Quote mode. When inserted at the beginning of a dial string, it can be
followed by dialable letters in either touch tone or pulse dial modes.
Quote mode also is used to indicate termination of dial string. The second quote is not required unless other commands follow the dial string.
/
Short delay. There is a 125-ms delay before the modem executes the dial
string. This command also can be used as a nondial command.
AT Commands
29
D (Dial) Basic Commands
W
Waits for a second dial tone before proceeding with dial-tone execution.
This feature is active when result code option ATX3 or greater has been
issued. If the modem is set to ATX2 or lower, the modem interprets W as
a comma (2-second pause default value or the value in the S8 register).
L
The modem dials the number stored in the last dialed buffer. This buffer
is reset by an ATZ command (see page 57) or by a power on reset.
ATDL? displays the number in the buffer.
If no argument is specified, the modem goes off hook and waits for an answer
tone in preparation for making a data connection.
DTE Interface
If AT&S1, DSR is asserted after dialing, when the modem detects the remote
modem’s answer tone. DSR is always asserted if AT&S0 (see page 77).
Aborting Events
Pressing any key aborts the dialing command. When a dial string is terminated, any additional commands following the dial string are not executed.
Other terminating events include:
- The modem cannot establish a data connection.
- No carrier is sensed after the specified time in S7 register has elapsed.
- The modem cannot detect a ring signal or silence during processing of an
@ command.
- The modem detects a busy signal and the ATX argument is set to 3, 4,
5, or 6 (see page 46).
- The modem detects no dial tone and the ATX argument is set to 2, 4, or 6
(see page 46).
30
PRELIMINARY
Basic Commands
Other
D (Dial)
The modem goes off hook and dials as soon as it detects a dial tone if the ATX
command is set to 2, 4, or 6 (see page 46).
The speaker is activated when the modem goes off hook, as set by the ATM
command (see page 39).
A dial string can include up to 60 characters, not including the AT prefix, a carriage return < cr >, and spaces.
When in voice mode (#CLS = 8):
1) The modem attempts to determine when the remote has picked up the
telephone line and once this determination has been made, the VCON
message is sent to the DTE. This determination is initially made based
upon ringback detection and disappearance. (See #VRA and #VRN commands.)
2) Once connected in voice mode, the modem immediately enters the command state and switches to online voice command mode. This mode enables unsolicited reporting of DTMF and answer tones to the DTE.
PRELIMINARY
AT Commands
31
E (Echo) Basic Commands
Command Syntax
ATE <argument>
Description
Enables the echo of commands to the DTE when in the command mode. Echo
is initialized by DIP switch #4. Echo also is initialized by the system reset command (see the ATZ command on page 57).
Arguments
0 or 1
0
The modem does not echo commands to the DTE in command mode.
1
The modem echoes commands to the DTE in the command mode.
Aborting Events
None
Other
The echo is turned off when parsing a command line and reverts to the state
defined by the ATE command.
32
PRELIMINARY
Basic Commands
F (Duplex)
Command Syntax
ATF <argument>
Description
Enables the modem to echo transmitted data to the DTE in an online mode.
Arguments
0 or 1
0
Transmitted data is echoed to the DTE in an online mode.
1
Transmitted data is not echoed to the DTE in an online mode (default).
If no argument is given, an argument of 0 is assumed.
Aborting Events
PRELIMINARY
None
AT Commands
33
H (On/Off Hook) Basic Commands
Command Syntax
ATH <argument>
Description
Connects the modem with the phone line.
Arguments
0 or 1
0
Modem goes on hook (opens phone line relay)
1
Modem goes off hook (closes phone line relay)
Aborting Events
None
Other
When in Voice Mode:
1) The H command forces #CLS = 0, but does not destroy any of the voice
parameter settings such as #VBS and #VSP. Therefore, the DTE cannot
issue an H command and pursue another voice call unless it issues a subsequent #CLS = 8 command. It does not have to reestablish the voice parameter settings again, unless a change in the settings is desired.
2) The #BDR setting is forced back to 0, reenabling autobaud.
3) If the #VLS setting is set to select a device which is not the telephone line
(such as a local handset or microphone), the H command deselects this
device and reselects the normal default setting (#VLS = 0). Normally, the
DTE does not issue the H command while connected to a local device
such as a handset, because merely selecting this device results in VCON.
The normal sequence of terminating a session with such a device is to use
the #VLS command to select the telephone line, which by definition makes
sure it is on hook.
34
PRELIMINARY
Basic Commands
Command Syntax
ATI <argument>
Description
Returns various information screens to the DTE.
Arguments
0, 1, 2, 3, 4, 5, 6, 7, 9, or 11
I (Inquiry)
0
A 4-digit product code, yyyx (where y is the maximum speed divided by
10 and x is a revision identifier), is sent to the DTE (default).
1
The modem performs a checksum operation on the supervisor code and
sends the results to the DTE.
2
The modem tests RAM by writing and reading alternating hex bytes 55h
and AAh into the RAM and returns a response (ERROR or OK) to the
DTE.
3
The modem returns the product ID string. This string contains the company name, the product line name, and the speed of the product. Additionally, some special features like fax and voice may be listed.
4
The modem sends a screen of data to the DTE indicating the following
present configuration settings:
- B, E, F, M, Q, V, and X commands
- DTE baud rate, parity, word length, dial type (pulse or tone), and H
setting (on or off hook)
- &A, &B, &C, &D, &G, &H, &I, &K, &M, &N, &P, &R, &S, &T, and &Y
- S register values from S0–S51
- The number dialed last
5
The modem sends two screens of data to the DTE, indicating the present
configuration of the following commands stored in each NVRAM template:
- Dial type (for B, F, M, X commands)
- E, Q, and V commands
- Stored default baud rate, parity, and word length
- &A, &B, &G, &H, &I, &K, &M, &N, &P, &R, &S, &T, and &Y settings
- &D and &C commands indicate:
PRELIMINARY
J
S register values from S0, S2–S15, S19, S21–S23, S25, S27,
S28, S29, S34, S38, S51
J
Phone numbers stored in locations 0 through 3
AT Commands
35
I (Inquiry) Basic Commands
6
The modem sends a diagnostic screen to the DTE with the following information from the previous data connection:
- Number of characters sent, received, lost
- Number of octets (compressed characters) sent and received
- Number of blocks sent, received, and resent
- Number of retrains requested and granted
- Number of line reversals
- Number of protocol blocks in error
- Number of link time-outs and link naks
- Negotiated settings for data compression (on/off), equalization
(long/short; contained in S15, bit 1)
- Fallback enabled/disabled indicates whether the modem negotiated
a fallback during connection
- Error correcting protocol (LAPM, MNP, or NONE)
- DCE speed
- Disconnect reason
- Duration of the last call
7
Product configuration. One screen of data is sent to the DTE; this screen
contains the following information:
-
8
36
Product type
Options: V.32
Clock frequency
EPROM size
RAM size
Code date
Code revision
Black list screen (international products only)
PRELIMINARY
Basic Commands
9
I (Inquiry)
Plug-and-Play feature. The following shows an example of the string issued by the modem:
(
; Begin PnP
1.0
; Plug-and-Play Version
; 1.0
;*note: ASCII vs. Binary
; representation
TEX
; EISA Manufacturer ID
; (TBD)
{MODEMNAME} FAX INT ( or EXT )
\
; No serial number
\MODEM
; Class ID
\TIA578
; Class 1 FAX
{MODEMNAME} FAX INT ( or EXT ) ; User Name
)
11
; End PnP
Diagnostics. One screen of data is sent to the DTE; this screen contains
the following information pertaining to the last link:
-
Aborting Events
PRELIMINARY
Modulation
Carrier frequency
Symbol rate
Trellis code
Nonlinear encoding status
Precoding status
Preemphasis level
Receive/transmit level
Signal/noise ratio
Near echo loss
Far echo loss
Round-trip delay time
<Ctrl>C or <Ctrl>K aborts the screen display. The display of screens can be
halted by <Ctrl>S and restarted by any key.
AT Commands
37
L (Volume)
Basic Commands
Command Syntax
ATL<argument>
Description
Controls the modem speaker volume
Arguments
0–3
Aborting Events
38
0
Low volume
1
Low volume
2
Medium volume (default)
3
High volume
None
PRELIMINARY
Basic Commands
Command Syntax
ATM <argument>
Description
Controls the modem speaker
Arguments
0–3
Aborting Events
PRELIMINARY
M (Speaker)
0
Turns the speaker off
1
Turns the speaker on during dial string execution until a carrier is detected or the modem goes on hook (default)
2
Turns the speaker on
3
Turns the speaker on after last digit in dial string is dialed; turns the
speaker off when a carrier is detected or until the time stored in the S7
register has elapsed
None
AT Commands
39
O (Online) Basic Commands
Command Syntax
ATO <argument>
Description
Returns the modem to a previously established connection
Arguments
0 or 1
0
Issued when modem is off hook and when S12 = 0 for detection of escape
code (online command mode). The modem remains online and returns
to a connected data transfer mode (default).
1
Issued when modem is in online command mode. Causes the modem
to return to the data mode and and at the same time initiates a retrain (but
only if speeds are above 1200 baud).
If this command is issued in an on hook state, an OK response code is returned.
Aborting Events
None
Other
If the modem is in an online command mode, the ATO command terminates
the online command mode and returns the modem to the data mode.
40
PRELIMINARY
Basic Commands
P (Pulse Dial)
Command Syntax
ATP
Description
Sets the modem in pulse mode when dialing a string. This is the default setting
on power up.
Arguments
None
Aborting Events
None
PRELIMINARY
AT Commands
41
Q (Quiet) Basic Commands
Command Syntax
ATQ <argument>
Description
Enables and disables a display of result codes.
Arguments
0–2
0
Result codes are sent to the DTE (default).
1
Result codes are not sent to the DTE.
2
Result codes are not sent when in the answer mode.
Aborting Events
None
Other
The quiet mode, where no results are sent to the DTE, is used in some applications. Such applications are printer/modem installations, where publishing the
result code to the DTE is undesirable.
42
PRELIMINARY
Basic Commands
S (S Register)
Command Syntax
ATSr = n
ATSr.b = n
Description
Modifies an S register setting or sends the contents to the DTE.
Arguments
ATSr = n
r
The S register number
n
The value (0 n 255) of the S register. Any other value for n results
in an ERROR response code being issued.
ATSr.b = n
Note: ATS Command
A period must immediately follow r for b to be a valid value.
Aborting Events
PRELIMINARY
r
The S register number
b
The S register bit position
n
The value (0 or 1) of the S register bit
None
AT Commands
43
T (Tone Dialing) Basic Commands
Command Syntax
ATT
Description
Sets the modem in touch-tone-dialing mode for dialing strings
Arguments
None
Aborting Events
None
44
PRELIMINARY
Basic Commands
V (Result Code Enable)
Command Syntax
ATV <argument>
Description
Transmits result codes to the DTE. Result codes can be either verbal or numeric
Arguments
0 or 1
Aborting Events
PRELIMINARY
0
Enables numeric result codes. Numeric codes are followed by the terminating character found in the S3 register [default is carriage return, < cr >
(0Dh)] (default).
1
Enables verbal result codes. Verbal codes are preceded by the terminating character contained in the S3 register [default is carriage return, < cr >
(0Dh)] and followed by the character contained in the S4 register [default
is line feed, < lf > (0Ah)].
None
AT Commands
45
X (Result Code Options) Basic Commands
Command Syntax
ATX <argument>
Description
Selects and deselects result codes and call progress options according to the
result codes in Table 1–11
Arguments
0–7
0
Basic subset is selected (see Table 1–11) (default).
1
Extended subset is selected (see Table 1–11).
2– 6 Advanced call progress codes are selected (see Table 1–11).
7
Reserved
Table 1–11. Result Codes
Argument
Result Code
X0
X1
X2
X3
X4
X5
X6
0/OK
X
X
X
X
X
X
X
1/CONNECT
X
X
X
X
X
X
X
2/RING
X
X
X
X
X
X
X
3/NO CARRIER
X
X
X
X
X
X
X
4/ERROR
X
X
X
X
X
X
X
X
X
X
X
X
X
7/BUSY
X
X
X
X
8/NO ANSWER†
X
X
X
X
X
X
X
X
X
5/CONNECT 1200
6/NO DIAL TONE
X
X
X
9/RESERVED
10/CONNECT 2400
X
X
11/RINGING
X
13/CONNECT 9600
X
X
X
X
X
18/CONNECT 4800
X
X
X
X
X
X
20/CONNECT 7200
X
X
X
X
X
X
21/CONNECT 12 000
X
X
X
X
X
X
25/CONNECT 14 400
X
X
X
X
X
X
43/CONNECT 16 800
X
X
X
X
X
X
85/CONNECT 19 200
X
X
X
X
X
X
91/CONNECT 21 600
X
X
X
X
X
X
99/CONNECT 24 000
X
X
X
X
X
X
† Requires @; replaces NO CARRIER
46
PRELIMINARY
Basic Commands
X (Result Code Options)
Table 1–11. Result Codes (Continued)
Argument
Result Code
PRELIMINARY
X1
X2
X3
X4
X5
X6
103/CONNECT 26 400
X0
X
X
X
X
X
X
107/CONNECT 28 800
X
X
X
X
X
X
151/CONNECT 31 200
X
X
X
X
X
X
155/CONNECT 33 600
X
X
X
X
X
X
256/CONNECT 28 000
X
X
X
X
X
X
260/CONNECT 29 333
X
X
X
X
X
X
264/CONNECT 30 666
X
X
X
X
X
X
268/CONNECT 32 000
X
X
X
X
X
X
180/CONNECT 33 333
X
X
X
X
X
X
272/CONNECT 34 666
X
X
X
X
X
X
276/CONNECT 36 000
X
X
X
X
X
X
184/CONNECT 37 333
X
X
X
X
X
X
280/CONNECT 38 666
X
X
X
X
X
X
284/CONNECT 40 000
X
X
X
X
X
X
188/CONNECT 41 333
X
X
X
X
X
X
192/CONNECT 42 666
X
X
X
X
X
X
196/CONNECT 44 000
X
X
X
X
X
X
200/CONNECT 45 333
X
X
X
X
X
X
204/CONNECT 46 666
X
X
X
X
X
X
208/CONNECT 48 000
X
X
X
X
X
X
212/CONNECT 49 333
X
X
X
X
X
X
216/CONNECT 50 666
X
X
X
X
X
X
220/CONNECT 52 000
X
X
X
X
X
X
224/CONNECT 53 333
X
X
X
X
X
X
228/CONNECT 54 666
X
X
X
X
X
X
232/CONNECT 56 000
X
X
X
X
X
X
236/CONNECT 57 333
X
X
X
X
X
X
AT Commands
47
X (Result Code Options) Basic Commands
Other
Table 1–12 contains some special dialing functions. These functions are activated by the value of the ATX command. Note that neither adaptive dialing nor
fast dialing can operate unless the ATX command is programmed for it. The
second (wait for second dial tone) and third functions (wait for answer ) implement a fixed delay only if the ATX command is not programmed for them.
Table 1–12. Special Dialing Functions
Argument
Dialing Function
X0
X2
X3
X4
X5
X6
X
X
X
X
X
Wait for second dial tone (W)
X
X
X
X
Wait for answer (@)
X
X
X
X
Adaptive dialing
Fast dialing
X1
X
X
X
The adaptive dialing function dials the first digit of a dial string using touch tone
and senses whether the phone-line dial tone is terminated. If phone-line dial
tone is terminated, it continues to dial the string using tone dialing. If phone-line
dial tone is not terminated, it reverts to pulse dialing and dials the entire string,
including the first digit.
The wait for second dial tone function dials the digits in the dial string before
the W, then senses a second dial tone before continuing to dial the rest of the
digits. If no dial tone is sensed after a specified time (stored in the S7 register),
the modem sends a NO CARRIER code to the DTE.
Fast dialing dials a dial string as soon as it detects a dial tone.
Aborting Events
None
/ARQ Result Codes
The codes below are comprehensive.
AT&A0 disables or AT&A1 (see page 62) enables the /ARQ codes shown below. A setting of ATX1 or greater is required to enable the result codes. The
default is AT&A1. Setting the S27 register to 128 results in codes for connections 7200 and above being displayed as 9600 messages.
-
48
14/CONNECT/ARQ (valid only when X is set to 0)
15/CONNECT 1200/ARQ
16/CONNECT 2400/ARQ
19/CONNECT 4800/ARQ
24/CONNECT 7200/ARQ
17/CONNECT 9600/ARQ
22/CONNECT 12 000/ARQ
PRELIMINARY
Basic Commands
-
PRELIMINARY
X (Result Code Options)
26/CONNECT 14 400/ARQ
47/CONNECT 16 800/ARQ
88/CONNECT 19 200/ARQ
94/CONNECT 21 600/ARQ
100/CONNECT 24 000/ARQ
104/CONNECT 26 400/ARQ
108/CONNECT 28 800/ARQ
152/CONNECT 31 200/ARQ
156/CONNECT 33 600/ARQ
257/CONNECT 28 000/ARQ
261/CONNECT 29 333/ARQ
265/CONNECT 30 666/ARQ
269/CONNECT 32 000/ARQ
181/CONNECT 33 333/ARQ
273/CONNECT 34 666/ARQ
277/CONNECT 36 000/ARQ
185/CONNECT 37 333/ARQ
281/CONNECT 38 666/ARQ
285/CONNECT 40 000/ARQ
189/CONNECT 41 333/ARQ
193/CONNECT 42 666/ARQ
197/CONNECT 44 000/ARQ
201/CONNECT 45 333/ARQ
205/CONNECT 46 666/ARQ
209/CONNECT 48 000/ARQ
213/CONNECT 49 333/ARQ
217/CONNECT 50 666/ARQ
221/CONNECT 52 000/ARQ
225/CONNECT 53 333/ARQ
229/CONNECT 54 666/ARQ
238/CONNECT 56 000/ARQ
239/CONNECT 57 333/ARQ
AT Commands
49
X (Result Code Options) Basic Commands
Use AT&A2 (see page 62) and a setting of ATX1 or greater to substitute the
following 2400 through 33600 bps result codes shown below. These codes
display the call’s modulation, V.90, x2, VFC, or V32, as well as ARQ or nonARQ status.
50
120/CONNECT 2400/V34
38/CONNECT 4800/V32
124/CONNECT 4800/V34
40/CONNECT 7200/V32
128/CONNECT 7200/V34
33/CONNECT 9600/V32
132/CONNECT 9600/V34
41/CONNECT 12 000/V32
136/CONNECT 12 000/V34
45/CONNECT 14 400/V32
139/CONNECT 14 400/VFC
140/CONNECT 14 400/V34
143/CONNECT 16 800/VFC
144/CONNECT 16 800/V34
147/CONNECT 19 200/VFC
148/CONNECT 19 200/V34
97/CONNECT 21 600/VFC
111/CONNECT 21 600/V34
101/CONNECT 24 000/VFC
113/CONNECT 24 000/V34
105/CONNECT 26 400/VFC
115/CONNECT 26 400/V34
109/CONNECT 28 800/VFC
117/CONNECT 28 800/V34
153/CONNECT 31 200/V34
157/CONNECT 33 600/V34
182/CONNECT 33 333/x2
186/CONNECT 37 333/x2
190/CONNECT 41 333/x2
194/CONNECT 42 666/x2
198/CONNECT 44 000/x2
202/CONNECT 45 333/x2
206/CONNECT 46 666/x2
210/CONNECT 48 000/x2
214/CONNECT 49 333/x2
218/CONNECT 50 666/x2
222/CONNECT 52 000/x2
226/CONNECT 53 333/x2
PRELIMINARY
Basic Commands
-
PRELIMINARY
X (Result Code Options)
230/CONNECT 54 666/x2
234/CONNECT 56 000/x2
258/CONNECT 28 000/V90
262/CONNECT 29 333/V90
266/CONNECT 30 666/V90
270/CONNECT 32 000/V90
288/CONNECT 33 333/V90
274/CONNECT 34 666/V90
278/CONNECT 36 000/V90
290/CONNECT 37 333/V90
282/CONNECT 38 666/V90
286/CONNECT 40 000/V90
292/CONNECT 41 333/V90
294/CONNECT 42 666/V90
296/CONNECT 44 000/V90
298/CONNECT 45 333/V90
300/CONNECT 46 666/V90
302/CONNECT 48 000/V90
304/CONNECT 49 333/V90
306/CONNECT 50 666/V90
308/CONNECT 52 000/V90
310/CONNECT 53 333/V90
312/CONNECT 54 666/V90
314/CONNECT 56 000/V90
122/CONNECT 2400/ARQ/V34
39/CONNECT 4800/ARQ/V32
126/CONNECT 4800/ARQ/V34
44/CONNECT 7200/ARQ/V32
130/CONNECT 7200/ARQ/V34
37/CONNECT 9600/ARQ/V32
134/CONNECT 9600/ARQ/V34
42/CONNECT 12 000/ARQ/V32
138/CONNECT 12 000/ARQ/V34
46/CONNECT 14 400/ARQ/V32
141/CONNECT 14 400/ARQ/VFC
142/CONNECT 14 400/ARQ/V34
145/CONNECT 16 800/ARQ/VFC
146/CONNECT 16 800/ARQ/V34
149/CONNECT 19 200/ARQ/VFC
150/CONNECT 19 200/ARQ/V34
98/CONNECT 21 600/ARQ/VFC
112/CONNECT 21 600/ARQ/V34
AT Commands
51
X (Result Code Options) Basic Commands
52
102/CONNECT 24 000/ARQ/VFC
114/CONNECT 24 000/ARQ/V34
106/CONNECT 26 400/ARQ/VFC
116/CONNECT 26 400/ARQ/V34
110/CONNECT 28 800/ARQ/VFC
118/CONNECT 28 800/ARQ/V34
154/CONNECT 31 200/ARQ/V34
158/CONNECT 33 600/ARQ/V34
183/CONNECT 33 333/ARQ/x2
187/CONNECT 37 333/ARQ/x2
191/CONNECT 41 333/ARQ/x2
195/CONNECT 42 666/ARQ/x2
199/CONNECT 44 000/ARQ/x2
203/CONNECT 45 333/ARQ/x2
207/CONNECT 46 666/ARQ/x2
211/CONNECT 48 000/ARQ/x2
215/CONNECT 49 333/ARQ/x2
219/CONNECT 50 666/ARQ/x2
223/CONNECT 52 000/ARQ/x2
277/CONNECT 53 333/ARQ/x2
231/CONNECT 54 666/ARQ/x2
235/CONNECT 56 000/ARQ/x2
239/CONNECT 57 333/ARQ/x2
259/CONNECT 28 000/ARQ/V90
263/CONNECT 29 333/ARQ/V90
267/CONNECT 30 666/ARQ/V90
271/CONNECT 32 000/ARQ/V90
289/CONNECT 33 333/ARQ/V90
275/CONNECT 34 666/ARQ/V90
279/CONNECT 36 000/ARQ/V90
291/CONNECT 37 333/ARQ/V90
283/CONNECT 38 666/ARQ/V90
287/CONNECT 40 000/ARQ/V90
293/CONNECT 41 333/ARQ/V90
295/CONNECT 42 666/ARQ/V90
297/CONNECT 44 000/ARQ/V90
299/CONNECT 45 333/ARQ/V90
301/CONNECT 46 666/ARQ/V90
303/CONNECT 48 000/ARQ/V90
305/CONNECT 49 333/ARQ/V90
307/CONNECT 50 666/ARQ/V90
309/CONNECT 52 000/ARQ/V90
PRELIMINARY
Basic Commands
X (Result Code Options)
- 311/CONNECT 53 333/ARQ/V90
- 313/CONNECT 54 666/ARQ/V90
- 315/CONNECT 56 000/ARQ/V90
PRELIMINARY
AT Commands
53
X (Result Code Options) Basic Commands
Use AT&A3 (see page 62) and a setting of ATX1 or greater to display LAPM,
or MNP and data compression for the V42bis and MNP5 protocols.
- CONNECT 57 333/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 56 000/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 54 666/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 53 333/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 52 000/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 50 666/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 49 333/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 48 000/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 46 666/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 45 333/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 44 000/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 42 666/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 41 333/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 40 000/ARQ/V90/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 38 666/ARQ/V90/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 37 333/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 36 000/ARQ/V90/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 34 666/ARQ/V90/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 33 333/ARQ/(V90 or x2)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 32 000/ARQ/V90/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 30 666/ARQ/V90/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 29 333/ARQ/V90/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 28 000/ARQ/V90/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 33 600/ARQ/V34/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 31 200/ARQ/V34/LAPM/V42BIS (or MNP/MNP5)
54
PRELIMINARY
Basic Commands
X (Result Code Options)
- CONNECT 28 800/ARQ/(V34 or VFC)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 26 400/ARQ/(V34 or VFC)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 24 000/ARQ/(V34 or VFC)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 21 600/ARQ/(V34 or VFC)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 19 200/ARQ/(V34 or VFC)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 16 800/ARQ/(V34 or VFC)/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 14 400/ARQ/(V32, VFC or V34)/LAPM/V42BIS
(or MNP/MNP5)
- CONNECT 12 000/ARQ/V32/LAPM/42BIS (or MNP/MNP5)
- CONNECT 9600/ARQ/V32/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 7200/ARQ/V32/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 4800/ARQ/V32/LAPM/V42BIS (or MNP/MNP5)
- CONNECT 2400/ARQ/MNP/MNP5 (or LAPM/V42BIS)
- CONNECT 2400/NONE
- CONNECT 1200/ARQ/MNP/MNP5 (or LAPM/V42BIS)
- CONNECT 1200/NONE
PRELIMINARY
AT Commands
55
Y (Set Default Profile) Basic Commands
Command Syntax
ATY <argument>
Description
Selects the default system profile. This command allows one of three possible
profiles (two stored NVRAM configurations and a factory default setting) to be
selected at power up and after a software reset. This parameter is stored separately within NVRAM and is read first before other values. This parameter determines the modem’s course of action during any kind of reset. The parameter
itself is reset by the AT&F command (see page 66).
Arguments
0–4
0
NVRAM configuration 0 (default)
1
NVRAM configuration 1
2
Factory configuration 0
3
Factory configuration 1
4
Factory configuration 2
Aborting Events
None
Other
The modem transmits an OK response code to the DTE before executing the
command then clears the command line buffer. If the A/ command is entered
subsequently, the modem acknowledges with an OK response code to the
DTE but does not execute any command. Any arguments that follow in the
command buffer are not executed.
56
PRELIMINARY
Basic Commands
Z (Reset)
Command Syntax
ATZ <argument>
Description
A software reset command. The modem resets to either of the NVRAM settings or to the factory default, depending on the argument issued with the command. The modem reads the parameter and changes settings accordingly.
Arguments
0–5
0
Load the configuration indicated by ATY command (see page 56) (default)
1
Reset and load NVRAM configuration 0
2
Reset and load NVRAM configuration 1
3
Reset and load factory configuration 0
4
Reset and load factory configuration 1
5
Reset and load factory configuration 2
Aborting Events
None
Other
The modem transmits an OK response code to the DTE before executing the
command then clears the command line buffer. Arguments that follow in the
command buffer are not executed.
The Z command resets all voice related parameters to default states, forces
the #BDR = 0 condition (autobaud enabled), and forces the telephone line to
be selected with the handset on hook. No voice parameters are stored in
NVRAM, so the profile loaded does not affect the voice aspects of this command.
PRELIMINARY
AT Commands
57
+++ (Escape Sequence) Basic Commands
Command Syntax
+++
Description
Terminates the connection when the modem is in the data mode or converts
to the online command mode, depending on the setting of the S13 register. The
command is a 3-character sequence defined by the S2 register (default = +,
decimal 43).
Arguments
None
Aborting Events
None
Other
The escape code sequence must be preceded and followed by a guard time of
1/50 of a second (contained in the S12 register).
e
Note: Hayes Escape Sequence
The Hayes escape sequence (+++) is intended for public use by customers
holding a license agreement with Hayes MicroComputer or those currently
seeking a license. TI software replaces the +++ with the Time independent
escape sequence (TIES) of +++AT.
58
PRELIMINARY
Basic Commands
<any key> (Terminate Current Dial/Answer Operation)
Command Syntax
<any key>
Description
Pressing any key on the keyboard terminates any dial or answer operations
occurring at the time.
Arguments
None
Aborting Events
None
PRELIMINARY
AT Commands
59
<Ctrl>S (Stop/Restart Help) Basic Commands
Command Syntax
<Ctrl>S
Description
Stops and restarts any of the help screens that can be displayed.
Arguments
None
Aborting Events
None
60
PRELIMINARY
Basic Commands
<Ctrl>C or <Ctrl>K (Cancel Help Screens)
Command Syntax
<Ctrl>C or <Ctrl>K
Description
Cancels the display of help screens.
Arguments
None
Aborting Events
None
PRELIMINARY
AT Commands
61
&A (ARQ Result Codes Enable) Extended Commands
1.6 Extended Commands
The following sections list and describe commands that may be used to supplement the basic commands.
Command Syntax
AT&A <argument>
Description
Enable or disables a display of ARQ result codes if the ATX command argument is 1 or greater (see ATX command on page 46).
Arguments
0–3
Aborting Events
62
0
Disables /ARQ connection result codes
1
Enables /ARQ connection result codes (default)
2
Indicates an additional V.32 or V.34 in result codes for calls of 4800 bps
or greater
3
Identifies protocol of call: LAPM, MNP, or NONE. If the modem is negotiated for data compression, the type of compression is added to the response code: V.42bis, MNP5.
None
PRELIMINARY
Extended Commands
Command Syntax
AT&B <argument>
Description
Selects a DTE interface rate
Arguments
0–2
Aborting Events
PRELIMINARY
&B (DTE Data Rate)
0
The modem DTE interface rate follows the DCE connection rate (default).
1
The modem DTE interface rate follows the DTE rate, regardless of the
DCE connection rate.
2
The DTE rate is fixed for ARQ calls and variable for non-ARQ calls (answer mode only.) When the modem goes off hook and answers in the
ARQ mode, it shifts its serial port rate to the rate written in NVRAM. In
non-ARQ mode, it acts as if set to AT&B0 when answering and switches
its serial port rate to match the call’s connection rate.
None
AT Commands
63
&C (Carrier Detect) Extended Commands
Command Syntax
AT&C <argument>
Description
Controls the carrier detect signal sent by the modem to the computer.
Arguments
0 or 1
0
The carrier detect (CD) override is always on (default).
1
The modem sends the carrier detect signal when it makes connection
with another modem and drops the signal when it disconnects.
DTE Interface
If AT&C1, the carrier detect enters into a true state when a connection is made.
The carrier detect returns to a false state after the connection is dropped.
Aborting Events
None
64
PRELIMINARY
Extended Commands
&D (Data Terminal Ready)
Command Syntax
AT&D <argument>
Description
Controls the DTR signal sent from the DTE to the modem.
Arguments
0–3
0
This is a DTR override; DTR is always on (default).
1
The online command mode is on DTR low. The modem enters the command mode on DTR transition to a low state. It returns online when DTR
returns to a high state.
2
The computer must send DTR for the modem to accept commands;
dropping DTR terminates a call (default).
3
The host must send DTR for the modem to accept commands; dropping
DTR terminates any active call and causes the modem to do a soft reset.
DTE Interface
DTR line
Aborting Events
None
PRELIMINARY
AT Commands
65
&F (Load Factory Settings) Extended Commands
Command Syntax
AT&F <argument>
Description
Loads the default factory setting from the ROM into the RAM.
Arguments
0–2
0
Loads standard factory configuration (default)
1
Loads factory configuration 1 for hardware flow control
2
Loads factory configuration 2 for software flow control
Aborting Events
None
Other
Below are the settings for the three factory configurations.
66
&F/&F0
Data size:
Parity:
Basic commands:
Extended commands:
7 bits
Even
X1
&A1, &H0, &I0, &R1
&F1
Data size:
Parity:
Basic commands:
Extended commands:
8 bits
None
X4
&A3, &H1, &I0, &R2
&F2
Data size:
Parity:
Basic commands:
Extended commands:
8 bits
None
X4
&A3, &H2, &I2, &R1
PRELIMINARY
Extended Commands
&G (Guard Tone)
Command Syntax
AT&G <argument>
Description
Transmits a guard tone after a 2100-Hz answer tone is transmitted during a
connection sequence. This command applies to overseas calls of 2400 or
1200 bps only.
Arguments
0–2
Aborting Events
PRELIMINARY
0
No guard tone sent (US/Canada) (default)
1
550-Hz guard tone follows answer tone (activated if ATB0, see page 28)
2
Enables 1800-Hz guard tone (activated if ATB0, see page 28)
None
AT Commands
67
&H (Transmit Flow Control) Extended Commands
Command Syntax
AT&H <argument>
Description
Enables and disables flow control on the transmitting channel.
Arguments
0–3
0
Disables data flow control (default)
1
Enables hardware flow control (CTS)
2
Enables software flow control using characters stored in the S22 register
for XON and the S23 register for XOFF
3
Enables hardware and software flow control
DTE Interface
CTS
Aborting Events
None
68
PRELIMINARY
Extended Commands
&I (Receive Software Flow Control)
Command Syntax
AT&I <argument>
Description
Enables software flow control options.
Arguments
0–5
0
Disables flow control (XON/XOFF) of received data. All ASCII characters
are transparent to the modem except the escape sequence (default).
1
The modem responds to XON and XOFF characters defined in the S22
and S23 registers, respectively, and passes the characters to the remote
DCE.
2
The modem responds to XON and XOFF characters defined in the S22
and S23 registers, respectively, but does not pass the characters to the
remote DCE.
3
Enables Hewlett Packard host mode. The modem receives an ENQ
(decimal 05 ASCII) character every 80 characters from the host through
the RS-232 line and returns an ACK (decimal 06 ASCII) character to the
host through the RS-232 line under two conditions:
- The modem responds immediately if the transmit buffers are empty.
- The modem responds with ACK if the transmit buffers are 90% full,
and responds with ACK when the transmit buffers fall below 30% full.
4
Enables Hewlett Packard terminal mode. The modem receives an ENQ
from the remote DCE and passes it to the DTE. The modem sends no
further data to the DTE until it responds with an ACK.
5
Enables special flow control as follows:
- If modem is in error-correction mode, it responds the same way as
if the argument were 2.
- If modem is not in error-correction mode, it responds as though the
argument were 0, except that it responds to XON and XOFF characters from the remote DCE and does not pass the characters to the
DTE.
Aborting Events
PRELIMINARY
None
AT Commands
69
&K (Data Compression) Extended Commands
Command Syntax
AT&K <argument>
Description
Enables MNP level 5 or V.42bis data compression. An established MNP or
LAPM link is required.
Arguments
0–3
0
Disables data compression. (default)
1
Automatic selection/deselection. Data compression is enabled if:
- The DTE data rate (see AT&B command on page 63) is greater than
the link rate (see AT&N command on page 72)
- The remote DCE supports either MNP level-5 option in the MNP link
request or V.42bis in the LAPM link request.
Aborting Events
70
2
Enables data compression. This mode keeps the modem from disabling
data compression; however, error control must be enabled (see AT&M4
or AT&M5 command on page 71).
3
Selective data compression disables MNP data compression but not
MNP error correction. It allows a V.42bis connection with compression
or an MNP connection without compression.
None
PRELIMINARY
Extended Commands
&M (Error Control and Synchronous Operation)
Command Syntax
AT&M <argument>
Description
Enables and disables error control option.
Arguments
0–5
0
No error control. The MNP or V.42 link request are ignored.
2
Reserved
3
Reserved
4
Enables automatic selection between V.42, MNP, and no error control
(default).
5
Enables error-control for all data links. If the remote DCE does not respond to V.42 or MNP link requests, the modem disconnects the call.
DTE Interface
DTR
Aborting Events
None
PRELIMINARY
AT Commands
71
&N (DCE Link Rate) Extended Commands
Command Syntax
AT&N <argument>
Description
Selects variable or fixed DCE data rates
Arguments
0–39
72
0
Variable link rate floor. Modem permits any minimum speed for DCE link
rate (default).
1
Minimum link rate at 300 bps. Modem connects to remote DCE if it operates at this rate or faster.
2
Minimum link rate at 1200 bps. Modem connects to remote DCE if it operates at this rate or higher.
3
Minimum link rate at 2400 bps. Modem connects to remote DCE if it operates at this rate or higher.
4
Minimum link rate at 4800 bps. Modem connects to remote DCE if it operates at this rate or higher using V.34 or V.32/V.32bis modulation.
5
Minimum link rate at 7200 bps. Modem connects to remote DCE if it operates at this rate or higher using V.34 or V.32bis modulation.
6
Minimum link rate at 9600 bps. Modem connects to remote DCE if it operates at this rate or higher using V.34 or V.32/V.32bis.
7
Minimum link rate at 12 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 or V.32bis modulation.
8
Minimum link rate at 14 400 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34, V.FC or V.32bis modulation.
9
Minimum link rate at 16 800 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 or V.FC modulation.
10
Minimum link rate at 19 200 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 or V.FC modulation.
11
Minimum link rate at 21 600 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 or V.FC modulation.
12
Minimum link rate at 24 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 or V.FC modulation.
13
Minimum link rate at 26 400 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 or V.FC modulation.
14
Minimum link rate at 28 800 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 or V.FC modulation.
PRELIMINARY
Extended Commands
PRELIMINARY
&N (DCE Link Rate)
15
Minimum link rate at 31 200 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 modulation.
16
Minimum link rate at 33 600 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.34 modulation.
17
Minimum link rate at 28 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
18
Minimum link rate at 29 333 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
19
Minimum link rate at 30 666 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
20
Minimum link rate at 32 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
21
Minimum link rate at 33 333 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
22
Minimum link rate at 34 666 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
23
Minimum link rate at 36 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
24
Minimum link rate at 37 333 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
25
Minimum link rate at 38 666 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
26
Minimum link rate at 40 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
27
Minimum link rate at 41 333 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
28
Minimum link rate at 42 666 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
29
Minimum link rate at 44 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
30
Minimum link rate at 45 333 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
31
Minimum link rate at 46 666 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
AT Commands
73
&N (DCE Link Rate) Extended Commands
32
Minimum link rate at 48 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
33
Minimum link rate at 49 333 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
34
Minimum link rate at 50 666 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
35
Minimum link rate at 52 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
36
Minimum link rate at 53 333 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
37
Minimum link rate at 54 666 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
38
Minimum link rate at 56 000 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
39
Minimum link rate at 57 333 bps. Modem connects to remote DCE if it
operates at this rate or higher using V.90 modulation.
DTE Interface
None
LED
None
Aborting Events
None
74
PRELIMINARY
Extended Commands
&P (Make/Break Ratio)
Command Syntax
AT&P <argument>
Description
Enables either of two possible phone line relay duty cycles used during pulse
dialing. One is used for the US and Canada, and the other is used for the
United Kingdom (UK).
Arguments
0 or 1
0
US and Canada make/break ratio of 39% / 61% (default)
1
UK make/break ratio of 33% / 67%
Aborting Events
None
Other
To call or answer overseas modems at 300 bps, set the modem to ITU-T V.21
mode (set S27 register to 1, see page 18).
PRELIMINARY
AT Commands
75
&R (Receive Data Hardware Flow Control) Extended Commands
Command Syntax
AT&R <argument>
Description
Enables options for received-data hardware flow control on received data.
Arguments
0–2
0
Reserved
1
The RTS signal is ignored (default).
2
The modem transmits data to the DTE only if the RTS is asserted.
DTE Interface
RTS, CTS
Aborting Events
None
Other
If both DTR and RTS are not asserted during a data connection and AT&R is
set to 2, the modem transmits result codes to the DTE. This happens because
in a basic program, the only way to drop the DTR is to close the COM port, forcing RTS low. In this case, the modem is not allowed to transmit a NO CARRIER
response code and goes on-hook, unless it interprets this combination of
events as a warrant to send the NO CARRIER response code.
76
PRELIMINARY
Extended Commands
Command Syntax
AT&S <argument>
Description
Specifies when the DSR signal is asserted
Arguments
0 or 1
0
DSR is always asserted.
1
DSR is asserted when the modem starts a data connection; it is not asserted when a carrier is lost (default).
DTE Interface
DSR
Aborting Events
None
PRELIMINARY
&S (DSR Options)
AT Commands
77
&T (Diagnostic Test)
Extended Commands
Command Syntax
AT&T <argument>
Description
Controls diagnostic test modes internal to the modem.
Arguments
0–8
0
Terminates current test (default)
1
Initiates analog loopback test at any link rate, modulation (except HST),
compression, or error control. The S16 register can be set to 4 for a test
pattern. The modem must be off line with no other test(s) in progress,
such as S16 =1. When it enters the test, the modem responds with a
CONNECT message when it is ready to receive loopback characters. If
the test is denied for one of the above reasons, an ERROR response
message is issued. If the modem is online when an ERROR message
is issued, the modem drops the call and responds with a CONNECT
message. It is then ready to receive a loop-back character.
This test is terminated if in online command mode by:
- Entering AT&T0, ATH0 (see page 34), or lowering the DTR. The mo-
dem goes off line and issues an OK response.
- Entering ATZ (see page 57), which ends the test and resets the mo-
dem.
- Allowing the test timer that uses the S18 register to expire.
- Hitting any key, if the S16 register is set to 4.
2
Reserved
3
Initiates digital loopback test at any link rate, modulation (except HST),
compression or error control. This test mode allows the remote end to
test its transmit and receive paths. All data received by the local modem
is returned. After receiving the command, the modem must be in the online command mode to start the test and issue an OK when the test is
terminated.
The test is terminated, if in online command mode, by:
- Entering AT&T0, which results in an OK response.
- Entering ATH0 (see page 34) or lowering the DTR. The modem goes
off line and issues an OK response.
- Entering ATZ (see page 57), which results in an OK response and
resets the modem.
- Allowing the test timer that uses the S18 register to expire.
78
PRELIMINARY
Extended Commands
&T (Diagnostic Test)
4
Grants remote digital loopback, which allows the local modem to respond to a request for remote digital loopback.
5
Denies remote digital loopback to the remote end requesting the loopback.
6
Initiates remote digital loopback at link rates of 2400 or 1200 bps with any
compression or error control. The modem must be off hook and in the online command mode with no other tests in progress, such as S16 = 1 or
8. If this condition is met and permission is granted by the remote modem, the modem then enters the state test and responds with a CONNECT message. Setting the S16 register to 4 sends a test pattern. If the
test is denied for any of these reasons, an ERROR message is issued
and the modem returns to the online command mode.
The test is terminated, if in online command mode, by any of the following:
- Entering AT&T0, which results in an OK response
- Entering ATH0 (see page 34) or lowering the DTR, which results in
an OK response and resets the modem
- Allowing the test timer that uses the S18 register to expire
- Hitting any key, if the S16 register is set to 4
7
Initiates the remote digital loopback with self test at link rates of 2400 or
1200 bps with any compression or error control. The modem must be offhook and in the online command mode with no other tests in progress,
such as S16 = 4. Remote access permission must also be granted. The
modem enters the test and issues an OK message. It then sends a pattern of repeating Us that cannot be seen by the user since the modem
stays in the online command mode. If the test is denied for any of the reasons above, an ERROR message is issued and the modem returns to
the online command mode.
The test is terminated, if in online command mode, by any of the following:
- Entering AT&T0, which gives a 3-digit error count (an error count of
255 is given for errors over 255), and issues an OK response.
- Entering ATH0 (see page 34) or lowering the DTR. The modem goes
off line and issues an OK response.
- Entering ATZ (see page 57), which results in an OK response and
resets the modem.
- Allowing the test timer that uses the S18 register to expire.
PRELIMINARY
AT Commands
79
&T (Diagnostic Test)
Extended Commands
8
Initiates an analog loopback with self test at any link rate, modulation (except HST), compression, or error control. The modem must be off line
with no other tests in progress, such as S16 = 1. The modem enters the
test from off line and issues an OK response. The modem then sends a
test pattern of repeating Us that cannot be seen by the user as the modem stays in the online command mode. If the test is denied for any of
the reasons above, an ERROR message is issued. If the modem is online when the ERROR message is issued, the modem drops the call, responds with a CONNECT response, and prepares to send loop-back
characters.
The test is terminated if in online command mode, by any of the following:
- Entering AT&T0, ATH0 (see page 34), or by lowering the DTR. After
receiving one of these commands, the modem gives a 3-digit error
count (an error count of 255 is given for errors over 255), goes off
line, and issues an OK response.
- Entering ATZ (see page 57), which results in the same error re-
sponse above and resets the modem.
- Allowing the test timer that uses the S18 register to expire, which re-
sults in a report and an OK response, such as AT&T0.
Aborting Events
80
None
PRELIMINARY
Extended Commands
&U (DCE Link Rate Floor)
Command Syntax
AT&U <argument>
Description
Sets minimum DCE connection data rates. This command works in conjunction with the AT&N command (see page 72). The following table defines the
interactions:
AT&U value
AT&N = 0
AT&N > 0
AT&U = 0 or AT&U > AT&N
Modem does not limit connect speed
Modem connects at AT&N speed only
AT&U > 0
Modem connects in range from maximum speed down to AT&U setting
Modem connects in range from AT&N
setting down to AT&U setting
Arguments
PRELIMINARY
0–39
0
Variable link rate floor. Modem permits any minimum speed for DCE link
rate (default).
1
Minimum link rate at 300 bps. Modem connects to remote DCE if it operates at this rate or faster.
2
Minimum link rate at 1200 bps. Modem connects to remote DCE if it operates at this rate or faster.
3
Minimum link rate at 2400 bps. Modem connects to remote DCE if it operates at this rate or faster.
4
Minimum link rate at 4800 bps. Modem connects to remote DCE if it operates at this rate or faster using V.34 or V.32/V.32bis modulation.
5
Minimum link rate at 7200 bps. Modem connects to remote DCE if it operates at this rate or faster using V.34 or V.32bis modulation.
6
Minimum link rate at 9600 bps. Modem connects to remote DCE if it operates at this rate or faster using V.34 or V.32/V.32bis .
7
Minimum link rate at 12 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 or V.32bis modulation.
8
Minimum link rate at 14 400 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34, V.FC or V.32bis modulation.
9
Minimum link rate at 16 800 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 or V.FC modulation.
10
Minimum link rate at 19 200 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 or V.FC modulation.
11
Minimum link rate at 21 600 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 or V.FC modulation.
At Commands
81
&U (DCE Link Rate Floor) Extended Commands
82
12
Minimum link rate at 24 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 or V.FC modulation.
13
Minimum link rate at 26 400 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 or V.FC modulation.
14
Minimum link rate at 28 800 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 or V.FC modulation.
15
Minimum link rate at 31 200 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 modulation.
16
Minimum link rate at 33 600 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.34 modulation.
17
Minimum link rate at 28 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 or V.FC modulation.
18
Minimum link rate at 29 333 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
19
Minimum link rate at 30 666 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
20
Minimum link rate at 32 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
21
Minimum link rate at 33 333 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
22
Minimum link rate at 34 666 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
23
Minimum link rate at 36 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
24
Minimum link rate at 37 333 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
25
Minimum link rate at 38 666 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
26
Minimum link rate at 40 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
27
Minimum link rate at 41 333 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
28
Minimum link rate at 42 666 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
PRELIMINARY
Extended Commands
29
Minimum link rate at 44 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
30
Minimum link rate at 45 333 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
31
Minimum link rate at 46 666 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
32
Minimum link rate at 48 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 or V.FC modulation.
33
Minimum link rate at 49 333 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
34
Minimum link rate at 50 666 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
35
Minimum link rate at 52 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
36
Minimum link rate at 53 333 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
37
Minimum link rate at 54 666 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
38
Minimum link rate at 56 000 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
39
Minimum link rate at 57 333 bps. Modem connects to remote DCE if it
operates at this rate or faster using V.90 modulation.
DTE Interface
None
Aborting Events
None
PRELIMINARY
&U (DCE Link Rate Floor)
AT Commands
83
&W (Write to NVRAM) Extended Commands
Command Syntax
AT&W <argument>
Description
Writes the current modem configuration to NVRAM. This command stores all
commands and registers that are not used in production test commands or in
the S1 register in NVRAM.
Arguments
0 or 1
0
Stores pattern 0 to NVRAM (default)
1
Stores pattern 1 to NVRAM
- The following command settings are stored in NVRAM:
B, F, M, X, E, Q, V, or L
- The following extended command settings are stored in NVRAM:
&A, &B, &G, &H, &I, &K, &M, &N, &P, &R, &S, &T (stores &T4 or&T5
only), &Y, &C, or &D.
- The following S register settings are stored in NVRAM:
S0, S2 to S13, S15, S19, S21 to S23, S25, S27 to S29, or S38
- The following settings are stored in NVRAM:
J
J
J
Aborting Events
84
&Z0 through &Z3 dial strings
Word length and parity
Data rate
None
PRELIMINARY
Extended Commands
&Y (Break Handling)
Command Syntax
AT&Y <argument>
Description
Enables various methods of handling break sequences when they are received from the DTE or remote DCE
Arguments
0–3
Aborting Events
PRELIMINARY
0
Destructive option. When the modem receives a break signal from the
DTE, it clears data from the transmit buffer but does not pass the break
to the remote DCE. Both local and remote modems reset data compression tables.
1
Expedited destructive option. When the modem receives a break signal
from the the DTE, it clears data from the transmit buffer, sends the break
to the remote DCE modem, and resets the data compression tables (default).
2
Expedited nondestructive option. When the modem receives a break signal from the DTE, it does not clear the transmit buffer but sends the break
sequence to the remote DCE.
3
Reserved
None
AT Command
85
&Z (Write Dial String to NVRAM) Extended Commands
Command Syntax
AT&Zn = s
AT&Zn = L
Description
Writes an input dial string or writes a previously dialed string to NVRAM:
- AT&Zn = s writes an input dial string to NVRAM
- AT&Zn = L writes a previously input dial string to NVRAM, where n is a.
Arguments
The arguments n and s are defined as follows:
n
Positions 0 through 3 (default = 0 if no value for n is given)
s
Dial string of up to 36 characters, not including the AT prefix, carriage return <cr>, and spaces. Nondial string commands are not allowed in the
dial string.
Aborting Events
None
Other
AT&ZL? displays the last executed dial string. There are no parameters for
this command.
AT&Zn? displays the current dial string stored in NVRAM.
Phone numbers are stored until a nondial command or a line terminator (S3
register) is encountered.
86
PRELIMINARY
Fax Class 1 Commands
+FARX (Asynchronous Receive)
1.7 Fax Class 1 Commands
The following sections list and describe the Fax Class 1 commands.
Command Syntax
AT+FARX = < argument>
Description
Enables the modem to receive data asynchronously using the modulation selected with the < argument > parameter.
Arguments
3, 24, 48, 72, 96, 97, 98, 121, 122, 145, and 146
Table 1–13. Command Options
Command
Description
+FTH = 3
V.21 channel 2300 bps
+FRH = 2
V.27ter 2400 bps
+FRH = 48
V.27ter 4800 bps
+FRH = 72
V.29 7200 bps
+FRH = 73
V.17 7200 bps long
+FRH = 74
V.17 7200 bps short
+FRH = 96
V.29 9600 bps
+FRH = 97
V.17 9600 bps long
+FRH = 98
V.17 9600 bps short
+FRH = 121
V.17 12 000 bps long
+FRH = 122
V.17 12 000 bps short
+FRH = 145
V.17 14 000 bps long
+FRH = 146
V.17 14 000 bps short
DTE Interface
The modem DTE interface is specified in EIA/TIA-578.
Aborting Events
None
PRELIMINARY
AT Commands
87
+FATX (Asynchronous Transmit)
Fax Class 1 Commands
Command Syntax
AT+FATX = < argument>
Description
Transmits data asynchronously using the modulation selected with the <argument> parameter.
Arguments
3, 24, 48, 72, 96, 97, 98, 121, 122, 145, and 146
Table 1–14. Command Options
Commands
Description
+FTH = 3
V.21 channel 2300 bps
+FRH = 2
V.27ter 2400 bps
+FRH = 48
V.27ter 4800 bps
+FRH = 72
V.29 7200 bps
+FRH = 73
V.17 7200 bps long
+FRH = 74
V.17 7200 bps short
+FRH = 96
V.29 9600 bps
+FRH = 97
V.17 9600 bps long
+FRH = 98
V.17 9600 bps short
+FRH = 121
V.17 12 000 bps long
+FRH = 122
V.17 12 000 bps short
+FRH = 145
V.17 14 000 bps long
+FRH = 146
V.17 14 000 bps short
DTE Interface
The modem DTE interface is specified in EIA/TIA-578.
Aborting Events
None
88
PRELIMINARY
Fax Class 1 Commands
Command Syntax
AT+FCLASS = < argument >
Description
Sets the current FCLASS to < argument >
Arguments
0 or 1
0
Data mode
1
Group 3 fax service class 1 mode
+FCLASS (Set FCLASS)
Aborting Events
None
Other
+FCLASS? returns the current FCLASS.
+FCLASS=? returns the possible values for FCLASS.
PRELIMINARY
AT Command
89
+FRH (Receive HDLC Data With Carrier) Fax Class 1 Commands
Command Syntax
AT+FRH = < argument >
Description
Enables the modem to receive the HDLC framed data using the modulation
selected with the <argument> parameter and deliver the next frame to the
DTE.
When the modem detects the selected carrier with an HDLC flag, the modem
responds with a CONNECT response code to the DTE. If a different signal is
detected, the modem responds with a +FCERROR (connect error) response
code to the DTE and returns to the command state.
Arguments
3, 24, 48, 72, 96, 97, 98, 121, 122, 145, and 146
Table 1–15. Command Options
+FTH = 3
V.21 channel 2300 bps
+FRH = 2
V.27ter 2400 bps
+FRH = 48
V.27ter 4800 bps
+FRH = 72
V.29 7200 bps
+FRH = 73
V.17 7200 bps long
+FRH = 74
V.17 7200 bps short
+FRH = 96
V.29 9600 bps
+FRH = 97
V.17 9600 bps long
+FRH = 98
V.17 9600 bps short
+FRH = 121
V.17 12 000 bps long
+FRH = 122
V.17 12 000 bps short
+FRH = 145
V.17 14 000 bps long
+FRH = 146
V.17 14 000 bps short
DTE Interface
The modem/DTE interface is specified in EIA/TIA-578.
Aborting Events
A loss of carrier aborts the +FRH command: the modem responds with a NO
CARRIER response code to the DTE and returns to the command state.
90
PRELIMINARY
Fax Class 1 Commands
+FRM (Receive Data With Carrier)
Command Syntax
AT+FRM = < argument>
Description
Enables the modem to receive data using the modulation selected with the
< argument> parameter.
When the modem detects the selected carrier, the modem responds with a
CONNECT response code to the DTE. If a different signal is detected, the modem responds with a +FCERROR (connect error) response code to the DTE
and returns to the command state.
Arguments
3, 24, 48, 72, 96, 97, 98, 121, 122, 145, and 146
Table 1–16. Command Options
Command
Description
+FTH = 3
V.21 channel 2300 bps
+FRH = 2
V.27ter 2400 bps
+FRH = 48
V.27ter 4800 bps
+FRH = 72
V.29 7200 bps
+FRH = 73
V.17 7200 bps long
+FRH = 74
V.17 7200 bps short
+FRH = 96
V.29 9600 bps
+FRH = 97
V.17 9600 bps long
+FRH = 98
V.17 9600 bps short
+FRH = 121
V.17 12 000 bps long
+FRH = 122
V.17 12 000 bps short
+FRH = 145
V.17 14 000 bps long
+FRH = 146
V.17 14 000 bps short
DTE Interface
The modem filters transparent commands, < DLE> < char >, as specified in
EIA/TIA-578.
Aborting Events
A loss of carrier aborts the +FRM commands the modem responds with a NO
CARRIER response.
PRELIMINARY
AT Command
91
+FRS (Wait For Silence) Fax Class 1 Commands
Command Syntax
AT+FRS = < argument>
Description
Enables the modem to monitor the line for inactivity for a specified amount of
time. The value < argument> is specified in 10-ms increments with limits from
0 to 255. This command terminates when the specified time of inactivity on the
line is detected or the DTE transmits another character to the modem, which
is then discarded. In either event, an OK response code is returned to the DTE.
Arguments
0–255 in 10 ms increments
Aborting Events
Any character sent from the DTE to the modem aborts the +FRS command.
The modem responds with an OK response code to the DTE.
92
PRELIMINARY
Fax Class 1 Commands
+FTH (Transmit HDLC Data With Carrier)
Command Syntax
AT+FTH = <argument >
Description
Enables the modem to transmit data framed in the HDLC protocol using the
modulation selected with the < argument> parameter. Table 1–17 lists the possible values for the <argument > parameter.
The modem responds with a CONNECT response code to the DTE and transmits signal converter training (if required) followed by flags until the first byte
of data is sent by the DTE.
Arguments
3, 24, 48, 72, 96, 97, 98, 121, 122, 145, and 146
Table 1–17. Command Options
Command
Description
+FTH = 3
V.21 channel 2300 bps
+FRH = 2
V.27ter 2400 bps
+FRH = 48
V.27ter 4800 bps
+FRH = 72
V.29 7200 bps
+FRH = 73
V.17 7200 bps long
+FRH = 74
V.17 7200 bps short
+FRH = 96
V.29 9600 bps
+FRH = 97
V.17 9600 bps long
+FRH = 98
V.17 9600 bps short
+FRH = 121
V.17 12 000 bps long
+FRH = 122
V.17 12 000 bps short
+FRH = 145
V.17 14 000 bps long
+FRH = 146
V.17 14 000 bps short
DTE Interface
The modem DTE interface is specified in EIA/TIA-578.
Aborting Events
None
PRELIMINARY
AT Command
93
+FTM (Transmit Data With Carrier) Fax Class 1 Commands
7Command Syntax
AT+FTM = <argument >
Description
Enables the modem to transmit data using the modulation selected with the
< argument> parameter.
The modem responds with a CONNECT response code and transmits the
proper training sequence in the selected mode, followed by a constant series
of 1 bits, until data is received from the DTE.
Arguments
3, 24, 48, 72, 96, 97, 98, 121, 122, 145, and 146
Table 1–18. Command Options
Command
Description
+FTH = 3
V.21 channel 2300 bps
+FRH = 2
V.27ter 2400 bps
+FRH = 48
V.27ter 4800 bps
+FRH = 72
V.29 7200 bps
+FRH = 73
V.17 7200 bps long
+FRH = 74
V.17 7200 bps short
+FRH = 96
V.29 9600 bps
+FRH = 97
V.17 9600 bps long
+FRH = 98
V.17 9600 bps short
+FRH = 121
V.17 12 000 bps long
+FRH = 122
V.17 12 000 bps short
+FRH = 145
V.17 14 000 bps long
+FRH = 146
V.17 14 000 bps short
DTE Interface
The modem filters transparent commands, < DLE> < char >, as specified in
EIA/TIA-578.
Aborting Events
The modem is interrupted when it receives a < DLE> < ETX> character from
the DTE.
94
PRELIMINARY
Fax Class 1 Commands
+FTS (Stop Transmission And Pause)
Command Syntax
AT+FTS = <argument >
Description
Halts the modem transmission. The modem waits a specified amount of time
and responds with an OK response code to the DTE. The value < argument>
is specified in 10-ms intervals with limits from 0 to 255.
Arguments
0–255 in 10 ms increments
Aborting Events
None
PRELIMINARY
AT Command
95
+FDR (Data Reception) Fax Class 2.0 Commands
1.8 Fax Class 2.0 Commands
Along with the commands listed and described in the following sections, the
Fax Class 2.0 command set includes two additional operations not found in the
Fax Class 1 command set. They are:
Testing: +F<parameter_name>=?
Testing a parameter returns the message OK, indicating that the command is
supported.
Executing: +F<parameter_name>
Executing performs the operations of the commands as detailed in the following subsections.
Command Syntax
AT+FDR
Description
Initiates data reception. This command may be issued after:
-
Other
96
Answering
Dialing
Receiving a document
Receiving a page
+FDR=? tests whether this command is supported by the modem.
PRELIMINARY
Fax Class 2.0 Commands
+FDT (Data Transmission)
Command Syntax
AT+FDT
Description
Requests that the modem transmit a message transmission page (phase C).
It is issued at the beginning of each page, either in pre-message (phase B) or
in post page message response (phase D). When the modem is ready to accept Phase C data, it issues the negotiation responses and the CONNECT result code to the DTE.
The modem filters the data stream as specified in EIA/TIA–592. If it detects
<DLE><ppm> characters, which are data stream terminators, it returns the OK
result code. The modem also performs the subsequent actions specified by
<ppm> and returns to the command state.
Other
PRELIMINARY
+FDT=? tests whether this command is supported by the modem.
AT Commands
97
+FIP (Initialize Fax Parameters) Fax Class 2.0 Commands
Command Syntax
AT+FIP
Description
Initializes the class 2.0 parameters to their default values. This command does
not change the setting of +FCLASS.
Other
+FIP=? tests whether this command is supported by the modem.
98
PRELIMINARY
Fax Class 2.0 Commands
+FKS (Session Termination)
Command Syntax
AT+FKS
Description
Initiates an orderly termination of a fax session. It sends a DCN message and
hangs up; at the end of the termination process, the modem reports the +FKS
response with the result code OK, goes on hook, and sets +FCLASS to 0.
Other
+FKS=? tests whether this command is supported by the modem.
PRELIMINARY
AT Commands
99
+FCO (Fax Connection) Fax Class 2.0 Modem Responses
1.9 Fax Class 2.0 Modem Responses
Class 2.0 modems are categorized by their four response types. They are:
-
1.9.1
Phase A (call setup)
Phase B (premessage procedure)
Phase C (message transmission)
Phase D (postmessage procedure)
Phase A Responses (Call Setup)
The Phase A responses are those that indicate when a connection has been
made to another station or modem.
Command Syntax
AT+FCO
Description
Indicates a connection has been made to a group 3 fax station
100
PRELIMINARY
Fax Class 2.0 Modem Responses
+FDM (Transition to Data Modem)
Command Syntax
AT+FDM
Description
Indicates that a connection has been made with a remote data modem and that
the local station is going to switch to a data modem. This response is enabled
when +FAA = 1 and disabled when +FAA = 0.
PRELIMINARY
AT Commands
101
+FCI (Report Remote ID, CSI) Fax Class 2.0 Modem Responses
1.9.2
Phase B Responses (Premessage Procedure)
The Phase B responses are those that generate the location or destination of
the message before it is sent.
Command Syntax
AT+FCI
Description
Reports the remote CSI ID string. The ATD, ATA, AT+FDT, or AT+FDR commands may generate this message.
102
PRELIMINARY
+FCS (DCS Frame Information)
Fax Class 2.0 Modem Responses
Command Syntax
Description
AT+FCS: <argument>
Reports the current session parameters. This message is sent after a +FDT
or +FDR command is executed and new DCS frames are sent.
The values of current session parameters are reported in the following order:
<VR>, <LBR>, <WD>, <LN>, <DF>, <EC>, <BT>, and <ST>. Shown in
Table 1–19 are the possible report values.
Table 1–19. +FCC, +FCS, and +FIS Subparameters
Label
Function
Values
VR
Vertical resolution
0
1
Normal, 98 lpi
Fine, 196 lpi
BR
Bit rate
0
1
2
3
2400
4800
7200
9600
WD
Page width
0
1
2
1728 pixels in 215 mm
(default)
2048 pixels in 255 mm
2432 pixels in 303 mm
bps (default)
bps
bps
bps
LN
Page length
0
1
2
A4, 297 mm
B4, 364 mm
Unlimited length (default)
DF
Data compression
format
0
1-D modified Huffman
EC
Error correction
0
Disabled
BF
Binary file transfer
0
Disabled
ST
Scan time per line
0 (default)
1
2
3
4
5
6
7
PRELIMINARY
Description
VR = 0
0 ms
5 ms
10 ms
10 ms
20 ms
20 ms
40 ms
40 ms
VR = 1
0 ms
5 ms
5 ms
10 ms
10 ms
20 ms
20 ms
40 ms
AT Commands
103
+FIS (DIS Frame Information) Fax Class 2.0 Modem Responses
Command Syntax
AT+FIS: <argument>
Description
Reports the remote station’s capabilities. The ATD, ATA, +FDT, or +FDR commands may generate this message.
The values of remote station’s capabilities are reported in the following order:
<VR>, <LBR>, <WD>, <LN>, <DF>, <EC>, <BT>, and <ST>. Shown in
Table 1–19 are the possible report values.
104
PRELIMINARY
Fax Class 2.0 Modem Responses
+FNC (Report NSC Frame)
Command Syntax
AT+FNC
Description
Reports a nonstandard commands frame. The ATD, ATA, +FDT, or +FDR
commands may generate this message.
PRELIMINARY
AT Commands
105
+FNF (Report NSF Frame) Fax Class 2.0 Modem Responses
Command Syntax
AT+FNF
Description
Reports a nonstandard facilities frame. The ATD, ATA, +FDT, or +FDR commands may generate this message.
106
PRELIMINARY
Fax Class 2.0 Modem Responses
+FNS (Report NSS Frame)
Command Syntax
AT+FNS
Description
Reports a nonstandard setup frame. The ATD, ATA, +FDT, or +FDR commands may generate this message.
PRELIMINARY
AT Commands
107
+FPI (Report Remote ID, CIG) Fax Class 2.0 Modem Responses
Command Syntax
AT+FPI
Description
Reports the remote CIG ID string. The ATD, ATA, +FDT, or +FDR commands
may generate this message.
108
PRELIMINARY
Fax Class 2 Modem Responses
+FPO (Remote Polling Indication)
Command Syntax
AT+FPO
Description
Indicates that the remote station has a document to poll. The ATD, ATA, +FDT,
or +FDR commands may generate this message.
PRELIMINARY
AT Commands
109
+FTC (DTC Frame Information) Fax Class 2.0 Modem Responses
Command Syntax
AT+FTC
Description
Reports the remote station’s capabilities. The ATD, ATA, +FDT, or +FDR commands may generate this message.
The values of remote station’s capabilities are reported in the following order:
<VR>, <LBR>, <WD>, <LN>, <DF>, <EC>, <BT>, and <ST>. Shown in
Table 1–19 are the possible report values.
110
PRELIMINARY
Fax Class 2.0 Modem Responses
+FTI (Report Remote ID, TSI)
Command Syntax
AT+FTI
Description
Reports the remote TSI ID string. The ATD, ATA, +FDT, or +FDR commands
may generate this message.
PRELIMINARY
AT Commands
111
+FPS (T.30 Phase C Page Reception) Fax Class 2.0 Modem Responses
1.9.3
Phase C Responses (Message Transmission)
The Phase C responses generate summary reports detailing the history of the
transmitted message.
Command Syntax
AT+FPS <PPR>, <LC>, <BLC>, <CBLC>, <LBC>
Description
The +FPS message is generated by the receiving station at the end of data
reception. The argumentts are as follows:
PPR
Reports the post page response according to Table 1–20
LC
Line count: reports the number of lines sent
BLC
Bad line count: reports the number of bad lines set
CBLC
Consecutive bad line count: reports the number of consecutive bad
lines sent
LBC
Lost byte count: reports the number of lost bytes
Table 1–20. Post Page Response (PPR)
112
Value
Label
Result
Code
Description
1
MCF
OK
Page is good
2
RTN
ERROR
Page is bad; retrain requested
3
RTP
OK
Page is good; retrain requested
4
PIP
OK
Page is good; remote request for a procedure interrupt
5
PIN
ERROR
Page is bad; remote request for a procedure
interrupt
PRELIMINARY
Fax Class 2.0 Modem Responses
1.9.4
+FET (Post Page Message)
Phase D Responses (Post Page Message Procedure)
Command Syntax
AT+FET
Description
The post page message indicates, as shown in Table 1–21, whether or not the
transmitting station has more data.
Table 1–21. Post Page Message (PPM) Codes
PRELIMINARY
PPM CODE
T.30 MNEMONIC
Description
0
MPS
Another page, same document
1
EOM
Another document
2
EOP
No more data
AT Commands
113
Reading, Testing, Settiing Fax Class 2.0 Parameters
1.10 Fax Class 2.0 Parameters
The parameters that control the operation of a class 2.0 fax modem are listed
and discussed in this section. There are three operations that can be performed on these parameters. They are:
Reading: +F<parameter_name>?
Reading a parameter returns the current value stored for that parameter.
Testing: +F<parameter_name>=?
Testing a parameter returns all the possible legal values for that parameter.
Setting: +F<parameter_name>=<value>
If the given value is a legal value for the parameter, the given value is
saved. If the given value is an illegal value, the parameter remains unchanged and an error message is returned.
Parameters designated as read only cannot be set or tested.
Unless otherwise specified, parameters with valid values of 0 and 1 must correspond with Table 1–22.
Table 1–22. Class 2.0 Parameters Having Valid Values of 1 and 0
Value
114
Description
0
Disabled
1
Enabled
PRELIMINARY
Fax Class 2.0 Parameters
+FCLASS (Service Class Selection Parameter)
Command Syntax
AT+FCLASS <argument>
Description
Sets the modem to operate as a data modem or a fax modem. The +FCLASS
parameter must be set to 2.0 to use the class 2.0 commands. The first time
+FCLASS = 2.0 is executed, all fax parameters are set to their default values.
Subsequent executions of +FCLASS = 2.0 have no effect other than to set the
serial port rate according to the +FPR parameter.
Arguments
0, 1, or 2
Other
PRELIMINARY
0
Data modem (default)
1
Fax modem, class 1
2
Fax modem, class 2.0
+FCLASS? returns the current +FCLASS value.
+FCLASS=? returns a list of possible values for +FCLASS.
AT Commands
115
+FMI (Request Manufacturer ID) Fax Class 2.0 Parameters
Command Syntax
AT+FMI
Description
Returns the manufacturer’s identification string. This is a read-only command.
116
PRELIMINARY
Fax Class 2.0 Parameters
+FMM (Request Model ID)
Command Syntax
AT+FMM
Description
Returns the model’s identification number. This is a read-only command.
PRELIMINARY
AT Commands
117
+FMR (Request Modem Revision) Fax Class 2.0 Parameters
Command Syntax
AT+FMR
Description
Returns the modem’s revision dates. This is a read-only command.
118
PRELIMINARY
Fax Class 2.0 Parameters
+FAA (Adaptive Answer)
Command Syntax
AT+FAA <argument>
Description
Controls the mode that the modem answers in and whether automatic mode
switching is enabled
Arguments
0 or 1
Other
PRELIMINARY
0
Answer as class 2.0 fax only. No automatic switching occurs (default)
1
Detects whether data modem or fax is calling and choose the appropriate
mode
+FAA? returns the current value of +FAA
+FAA=? returns a list of possible values for +FAA
AT Commands
119
+FCC (Modem Capabilities) Fax Class 2.0 Parameters
Command Syntax
AT+FCC
Description
Constrain modem capability for all sessions. Any modification to +FCC causes
the +FCC values to be copied into +FIS (see +FIS on page 128).
Values
VR, BR, WD, LN, DF, EC, BF, ST
(Default = 0, 0, 0, 2, 0, 0, 0, 0)
Table 1–23. +FCC Subparameters
120
Label
Function
Values
Description
VR
Vertical resolution
0
1
Normal, 98 lpi (default)
Fine, 196 lpi
BR
Bit rate
0
1
2
3
2400
4800
7200
9600
WD
Page width
0
1
2
1728 pixels in 215 mm
2048 pixels in 255 mm
2432 pixels in 303 mm
LN
Page length
0
1
2
A4, 297 mm
B4, 364 mm
Unlimited length (default)
DF
Data compression
format
0
1-D modified Huffman
EC
Error correction
0
Disabled
BF
Binary file transfer
0
Disabled
ST
Scan time per line
0
1
2
3
4
5
6
7
VR = 0
0 ms
5 ms
10 ms
10 ms
20 ms
20 ms
40 ms
40 ms
bps
bps
bps
bps
VR = 1
0 ms
5 ms
5 ms
10 ms
10 ms
20 ms
20 ms
40 ms
PRELIMINARY
Fax Class 2.0 Parameters
+FCQ (Copy Quality Checking)
Command Syntax
AT+FCQ <argument>
Description
Controls the detection and correction of data errors when transmitting and receiving data.
Arguments
RQ, TQ
Table 1–24. +FCQ Values
Subparameter
Value
RQ
0
Receive checking disabled; +FPS is set to 1
1
Receive checking enabled (default)
2
Receive checking enabled. Modem detects and
correct errors
0
Transmit checking disabled (default)
1
Transmit checking enabled; modem sends
<CAN> following any errors
2
Transmit checking enabled; modem detects and
corrects errors
TQ
Other
PRELIMINARY
Description
+FCQ? returns the current values of +FCQ.
+FCQ=? returns a list of possible values of +FCQ.
AT Commands
121
+FCR (Capability to Receive) Fax Class 2.0 Parameters
Command Syntax
AT+FCR<argument>
Description
Enables or disables fax reception.
Arguments
0 or 1
Other
122
0
Disabled
1
Enabled (default)
+FCR? returns the current values of +FCR.
+FCR=? returns a list of possible values of +FCR.
PRELIMINARY
Fax Class 2.0 Parameters
+FCS (Current Session Parameters)
Command Syntax
AT+FCS
Description
Returns the current session capabilities as negotiated by the receiving and
transmitting stations. This is a read-only command.
The +FCS command is set to the default values after:
1) Modem initialization
2) Execution of +FIP (initialize parameters) command
3) Termination of a session
Values
VR, BR, WD, LN, DF, EC, BF, ST
(Default = 0, 0, 0, 0, 0, 0, 0, 0)
Table 1–25. +FCS Subparameters
PRELIMINARY
Label
Function
Values
Description
VR
Vertical resolution
0
1
Normal, 98 lpi (default)
Fine, 196 lpi
BR
Bit rate
0
1
2
3
2400
4800
7200
9600
WD
Page width
0
1
2
1728 pixels in 215 mm
2048 pixels in 255 mm
2432 pixels in 303 mm
LN
Page length
0
1
2
A4, 297 mm (default)
B4, 364 mm
Unlimited length
DF
Data compression
format
0
1-D modified Huffman
EC
Error correction
0
Disabled
BF
Binary file transfer
0
Disabled
ST
Scan time per line
0
1
2
3
4
5
6
7
VR = 0
0 ms
5 ms
10 ms
10 ms
20 ms
20 ms
40 ms
40 ms
bps
bps
bps
bps
VR = 1
0 ms
5 ms
5 ms
10 ms
10 ms
20 ms
20 ms
40 ms
AT Commands
123
+FCT (DTE Phase C Time-Out)
Fax Class 2.0 Parameters
Command Syntax
AT+FCT<argument>
Description
Determines how long the modem waits for a command after transmitting all
available phase C data. If the time-out is reached, the modem issues an orderly abort command, +FKS.
Arguments
0–255 seconds
(default = 30)
124
PRELIMINARY
Fax Class 2.0 Parameters
+FHS (Call Termination Status)
Command Syntax
AT+FHS
Description
Indicates the cause of the most recent hangup. This is a read-only command.
Values
0–FFh
Table 1–26. FHS Values
Value (hex)
0–0F
Call placement and termination:
00
Normal and proper end of connection (default)
01
Ring detect without successful handshake
02
Call aborted from +FKS or <CAN>
03
No loop current
04
Ringback detected; no answer
05
Ringback detected; answer without CED
10–1F
Transmit phase A and miscellaneous errors:
10
Unspecified phase A error
11
No answer
20–3F
Transmit phase B hang-up codes:
20
Unspecified transmit phase B error
21
Remote cannot receive or send
22
COMREC (communication recode) error in transmit phase B
23
COMREC invalid command received
24
RSPREC error
25
DCS sent three times without response
26
DIS/DTC received three times
27
Failure to train at 2400 bps or +FMS value
28
RSPREC (response recode) invalid response received
40–4F
PRELIMINARY
Description
Transmit phase C hang-up codes:
40
Unspecified transmit phase C error
41
Unspecified image format error
42
Image conversion error
43
DTE to DCE underflow
AT Commands
125
+FHS (Call Termination Status) Fax Class 2.0 Parameters
Table 1–26. FHS Values Continued)
44
Unrecognized transparent data command
45
Image error; line length wrong
46
Image error; page length wrong
47
Image error; wrong compression code
50–6F
50
Unspecified transmit phase D error
51
RSPREC error
52
No response to MPS
53
Invalid response to MPS
54
No response to EOP
55
Invalid response to EOP
56
No response to EOM
57
Invalid response to EOM
58
Unable to continue after PIN or PIP
70–8F
Receive Phase B hang-up codes:
70
Unspecified receive phase B error
71
RSPREC error
72
COMREC error
73
T.30 T2 time-out; expected page not received
74
T.30 T1 time-out; after EOM received
90–9F
Receive phase C hang-up codes:
90
Unspecified receive phase C error
91
Missing EOL
93
DCE to DTE buffer overflow
A0–BF
126
Transmit phase D hang-up codes:
Receive phase D hang-up codes:
A0
Unspecified receive phase D errors
A1
RSPREC invalid response
A2
COMREC invalid response
A3
Unable to continue after PIN or PIP
PRELIMINARY
Fax Class 2.0 Parameters
+FHS (Call Termination Status)
Table 1–26. FHS Values (Continued)
PRELIMINARY
C0–DF
Reserved for future standardization
E0–EF
Reserved for manufacturer use
AT Commands
127
+FIS (Current Session Negotiating Position) Fax Class 2.0 Parameters
Command Syntax
AT+FIS
Description
Defines the modem’s capabilities for the current session. The +FIS parameter
is set to the values stored in +FCC after:
1)
2)
3)
4)
Values
Modem initialization
Execution of +FIP (initialize parameters) command
Modification of the +FCC parameters
Termination of a session
VR, BR, WD, LN, DF, EC, BF, ST
(Default = 0, 0, 0, 2, 0, 0, 0, 0)
Table 1–27. +FIS Subparameters
128
Label
Function
Values
Description
VR
Vertical resolution
0
1
Normal, 98 lpi (default)
Fine, 196 lpi
BR
Bit rate
0
1
2
3
2400
4800
7200
9600
WD
Page width
0
1
2
1728 pixels in 215 mm
2048 pixels in 255 mm
2432 pixels in 303 mm
LN
Page length
0
1
2
A4, 297 mm
B4, 364 mm
Unlimited length (default)
DF
Data compression
format
0
1-D modified Huffman
EC
Error correction
0
Disabled
BF
Binary file transfer
0
Disabled
ST
Scan time per line
0
1
2
3
4
5
6
7
VR = 0
0 ms
5 ms
10 ms
10 ms
20 ms
20 ms
40 ms
40 ms
bps
bps
bps
bps
VR = 1
0 ms
5 ms
5 ms
10 ms
10 ms
20 ms
20 ms
40 ms
PRELIMINARY
Fax Class 2.0 Parameters
+FLI (Local ID)
Command Syntax
AT+FLI <argument>
Description
Sets the local ID string used by the remote station to identify the originating
station.
Arguments
Up to 20 printable ASCII characters
(Default = null string)
Other
+FLI? returns the current value of +FLI.
+FLI=? returns a list of possible values of +FLI.
PRELIMINARY
AT Commands
129
+FLP (Indicate Document to Poll) Fax Class 2.0 Parameters
Command Syntax
AT+FLP <argument>
Description
Indicates whether there is a document to poll.
Arguments
0 or 1
130
0
Indicates that there is no document to poll (default)
1
Indicates that a document exists to poll. This parameter is reset to 0 after
the polled document is sent.
PRELIMINARY
Fax Class 2.0 Parameters
+FMS (Minimum Phase C Speed)
Command Syntax
AT+FMS=<argument>
Description
Sets the minimum rate for data transmission in phase C.
Note: If the receiving modem cannot accept this minimum transmission rate,
the call is disconnected. This parameter can be used to limit the data transfer
time and cost.
Value
0–5
Table 1–28. Transmission Rates
PRELIMINARY
Value
Data Transmission Rate
0
2400 bps (default)
1
4800 bps
2
7200 bps
3
9600 bps
4
12 000 bps
5
14 400 bps
AT Commands
131
+FNR (Negotiations Message Reporting) Fax Class 2.0 Parameters
Command Syntax
AT+FNR <argument>
Description
Enables or disables reporting of various messages. A value of 0 disables reporting. A value of 1 enables reporting. The default for each label is 0.
Arguments
RPR, TPR, IDR, NSR
(Default = 0, 0, 0, 0)
Table 1–29. +FNR Subparameters
132
Label
Reports Affected
RPR
Receiver parameters, +FIS and +FTC
TPR
Transmitter parameters, +FCS
IDR
ID strings, +FTI, +FCI, and +FPI
NSR
Nonstandard frames, +FNF, +FNS, and +FNC
PRELIMINARY
Fax Class 2.0 Parameters
+FNS (Nonstandard Frame FIF Parameter)
Command Syntax
AT+FNS <argument>
Description
Stores a nonstandard facilities frame to be used as NSF or NSS. The string
can be appended by repeated writes. If a null string is written, then the string
is initialized to null and the previous octets are deleted.
Arguments
String of hex offsets to a maximum of 90
(Default = null string)
PRELIMINARY
AT Commands
133
+FPI (Local Polling ID) Fax Class 2.0 Parameters
Command Syntax
AT+FPI <argument>
Description
Used by the remote station to identify the originating station
Arguments
Up to 20 printable ASCII characters
(Default = null string)
134
PRELIMINARY
Fax Class 2.0 Parameters
+FSP (Request to Poll)
Command Syntax
AT+FSP<argument>
Description
Indicates whether the originating station wants to receive a polled document.
Arguments
0 or 1
PRELIMINARY
0
Indicates that the originating station does not want to poll (default)
1
Indicates that the originating station can receive a polled document. This
parameter is reset to 0 after a polled document is received. Note: For a
station to receive a polled document, +FCR capability to receive must
also be set to 1.
AT Commands
135
+FBO (Data Bit Order) Fax Class 2.0 Parameters
1.10.1 DTE-DCE Interface Parameters
The DTE-DCE interface parameters provide a .........
Command Syntax
AT+FBO <argument>
Description
Controls the bit order for phase C data transfers. The bit order for phase B and
phase D data transfers is always direct order.
Arguments
0 or 1
136
0
Selects direct bit order for phase C data transfers (default)
1
Selects reversed bit order for phase C data transfers
PRELIMINARY
Fax Class 2.0 Parameters
+FBS (Buffer Size)
Command Syntax
AT+FBS
Description
Reports the sizes of the transmit and receive buffers. The first value is the
transmit buffer size and the second value is the receive buffer size. This is a
read only command.
Value
TBS, RBS
(Default = 1800, 4000)
PRELIMINARY
AT Commands
137
+FEA (Phase C Received EOL Alignment)
Fax Class 2.0 Parameters
Command Syntax
AT+FEA <argument>
Description
Enables or disables byte alignment of EOL markers in the data stream
Arguments
0 or 1
138
0
Disables EOL alignment (default)
1
Enables EOL alignment
PRELIMINARY
Fax Class 2.0 Parameters
+FLO (Flow Control Selection)
Command Syntax
AT+FLO <argument>
Description
Selects the method of flow control used in data transfer between the modem
and the serial port.
Arguments
0–2
PRELIMINARY
0
XON / XOFF control disabled
1
XON / XOFF control enabled (default)
2
Hardware flow control
AT Commands
139
+FPP (Packet Protocol Selection) Fax Class 2.0 Parameters
Command Syntax
AT+FPP=<argument>
Description
Enables and disables packet protocol.
Arguments
0 or 1
140
0
Disables packet protocol (default)
1
Enables packet protocol
PRELIMINARY
Fax Class 2.0 Parameters
+FPR (Serial Port Rate Selection)
Command Syntax
AT+FPR <argument>
Description
Selects the serial port rate used by the modem. A value of 0 selects the modem
to autobaud with the remote station.
Arguments
0–24
Table 1–30. +FPR Values
PRELIMINARY
Value
Port Rate
0
Autobaud (default)
1
2400
2
4800
4
9600
8
19 200
16
38 400
24
57 600
AT Commands
141
#BDR (Select Baud Rate) Voice Commands
1.11 Voice Commands
The audio response or voice commands perform functions that allow you to
set the internal and external modes of communication; by modem or manually.
The commands are listed and described in the following sections.
Command Syntax
AT#BDR = <argument>
Description
Forces the modem to select a specific DTE/modem baud rate without further
speed sensing on the interface
Arguments
0–48
0
Enables autobaud detection on the DTE interface (default)
1–48 Sends an OK message at the current speed, then switches to the new
speed defined by n2400 bps, unless and until another #BDR = n command is received. Autobaud is disabled, and the character format is
maintained at the format most recently detected.
DTE Interface
When modem is in online voice command mode and the #BDR setting is nonzero (no autobaud selected), the modem supports a full-duplex DTE interface.
This means that the DTE can enter commands at any time, even if the modem
is in the process of sending a shielded code, indicating DTMF detection to the
DTE. When the modem is selected in online voice command mode and the
#BDR setting is 0 (autobaud selected), shielded code reporting to the DTE is
disabled.
Aborting Events
None
Other
#BDR? returns the current setting of the #BDR command as an ASCII decimal
value in result code format.
142
PRELIMINARY
Voice Commands
#CID (Enable Caller ID)
Command Syntax
AT#CID = <argument>
Description
Selects or disables caller ID recognition and reporting in any mode
Arguments
0–2
0
Disables caller ID (default)
1
Enables formatted caller ID reporting of ICLID SDM (single data message) and MDM (multiple data message) packets
2
Enables unformatted caller ID reporting of any ICLID packet received
after the first RING cycle including SDM, MDM, or call waiting packets
Aborting Events
None
Other
#CID? returns the current value of #CID.
PRELIMINARY
AT Commands
143
#CLS (Select Data, Fax, or Voice)
Voice Commands
Command Syntax
AT#CLS = <argument>
Description
#CLS= selects data, fax, or voice mode
Arguments
0, 1, 2, or 8
144
0
Data. This is similar to setting +FCLASS = 0, and instructs the modem
to act like a data modem on subsequent answer or originate operations.
When a disconnect or inactivity time-out in the nonautobaud mode is detected, the modem automatically sets the #CLS setting to 0 and hangs
up. This ensures that the modem is always in a known state, despite disorderly DTE behavior (default).
1
Class 1 fax mode. This is similar to setting +FCLASS = 1, which tells the
modem that it is a class 1 fax modem. Once this is set, either the +FAA
or +FAE command can be used to force subsequent answers to conform
to class 1 adaptive answers.
2
Class 2.0 fax mode. This is similar to setting +FCLASS = 2, which tells
the modem that it is a class 2.0 fax modem. Once this is set, the +FAA
command can be used to force subsequent answers to conform to class
2.0 adaptive answers.
8
Voice mode. This is the main setting the DTE uses to effect directed or
adaptive answer or originate sequences involving voice modes. All telephone calls initialized by #CLS = 8 (after answer or successful call progress) cause the modem to be in online voice command mode.
PRELIMINARY
Voice Commands
#MFR? (Identify Manufacturer of Modem)
Command Syntax
AT#MFR?
Description
Returns the modem manufacturer information
PRELIMINARY
AT Commands
145
#REV? (Identify Supervisor Code Revision Level of Modem) Voice Commands
Command Syntax
AT#REV?
Description
Returns the revision level of the modem. Enabled only in voice mode.
146
PRELIMINARY
Voice Commands
#VBQ? (Query Buffer Size)
Command Syntax
AT#VBQ?
Description
Returns the size of the modem’s voice transmit and voice receive buffers in
ASCII decimal, followed by the OK result code.
PRELIMINARY
AT Commands
147
#VBS (Bits Per Sample) Voice Commands
Command Syntax
AT#VBS = <argument>
Description
Selects the degree of ADPCM voice compression to be used in bits per sample
Arguments
2, 3 or 4 (default = 4)
Aborting Events
None
Other
#VBS? returns the current setting of the #VBS command as an ASCII decimal
value in result code format.
148
PRELIMINARY
Voice Commands
#VBT (Beep Tone Timer)
Command Syntax
AT#VBT=<argument>
Description
Defines the time period used by the modem as the DTMF or fixed tone duration
for generating tones via the D command while in online voice command mode.
The time period is specified in tenths of a second up to four seconds.
Arguments
0–40
0
Disables the tone generation capability
1–40
Sets the tone duration time (default = 10)
Aborting Events
None
Other
#VBT? returns the current setting of the #VBT command as an ASCII decimal
value in result code format.
PRELIMINARY
AT Commands
149
#VCI? (Identify Compression Method) Voice Commands
Command Syntax
AT#VCI?
Description
Returns the modem’s compression method and raw bits-per-sample capability
150
PRELIMINARY
Voice Commands
#VGR (Select Voice Receive Gain)
Command Syntax
AT#VGR = <argument>
Description
Sets the speaker volume, when the modem is in speakerphone mode. Based
on this parameter, the threshold for the AGC is set inside the DCE. The number
has no meaning when not in speakerphone mode. Values larger than 128 indicate a larger gain than nominal and values less than 128 indicate a smaller
gain than nominal.
Arguments
0–255
0
Mute speaker
1–255 Sets the volume of the speaker when in speakerphone mode
(default = 128)
PRELIMINARY
AT Commands
151
#VGT (Select Voice Transmit Gain) Voice Commands
Command Syntax
AT#VGT = <argument>
Description
Sets the sensitivity of the microphone in speakerphone mode. Based on this
parameter, the threshold for the AGC is set inside the DCE. The number has
no meaning when not in speakerphone mode. Values larger than 128 indicate
a larger gain than nominal and values less than 128 indicate a smaller gain
than nominal.
Arguments
0–255
0
Mute
1–255 Sets microphone sensitivity when in speaker-phone mode
(default = 128)
152
PRELIMINARY
Voice Commands
#VLS (Voice Line Select)
Command Syntax
AT#VLS = <argument>
Description
Selects which devices are routed through the modem
Arguments
0, 1, 2, 3, 4, 6 or ?
0
The default option on the modem. This command instructs the modem
that when entering any of the three voice-operating submodes (online
command, transmit, or receive), the telephone line interface should be
routed through the modem. The OK response is sent to the DTE, and any
previous connection is lost (i.e., the modem ends up on hook as a result
of issuing this command to connect to the telephone line).
1
This argument instructs the modem to route only the handset through the
modem. You can choose this setting before recording a greeting message.
2
This argument instructs the modem to route only the speaker through the
modem. You can choose this setting before playing back any message.
The modem immediately switches to online voice command mode, and
the VCON response is generated for completeness. However, since this
is an output-only device, nothing can happen until the DTE sends the
#VTX command.
3
This argument instructs the modem that only the auxiliary input device
(microphone) should be routed through the modem. You can choose this
setting before recording a greeting message.
4
This argument is the same as #VLS = 0, except that the modem enables
the internal speaker as well as the telephone line/handset circuit.
6
This argument instructs the modem that both the microphone and speaker should be routed through the modem. You can choose setting for full
duplex AEC speakerphone operation.
?
Requests a report of the device types available for selection. The response is a series of numbers separated by commas, and each number
indicates a device position number.
Aborting Events
None
Other
#VLS? returns the current setting of the #VLS command as an ASCII decimal
value in result code format.
PRELIMINARY
AT Commands
153
#VRA (“Ringback Goes Away” Timer) Voice Commands
Command Syntax
AT#VRA = <argument>
Description
When originating a voice call (#CLS=8), sets the “ringback goes away” timer
value. This value is the amount of time (in units of 100 ms) to be measured from
when the ringback cadence stops once detected. If ringback is not detected
within this period, the modem assumes that the remote has picked up the line
and switches to online voice command mode. Every time a ringback cycle is
detected, this timer is reset.
Arguments
0–255
0
Turns off the “ringback goes away” timer
1–255 Defines the period without ringback (after at least one ringback has
been detected) in 100-ms units (default = 70)
Aborting Events
None
Other
#VRA? returns the current setting of the #VRA command as an ASCII decimal
value in result code format.
154
PRELIMINARY
Voice Commands
#VRN (“Ringback Never Came” Timer)
Command Syntax
AT#VRN = <argument>
Description
Used to set the “ringback never came” timer value when originating a voice call
(#CLS=8). This value is the amount of time (in 100 ms units) to be measured
from completion of dialing. If ringback is not detected within this period, the modem assumes the remote has picked up the line and switches to online voice
command mode.
Arguments
0–255
0
Turns off the “ringback never came” timer
1–255 Defines the period without ringback after dialing in 100-ms units
(default = 100)
Aborting Events
None
Other
#VRN? returns the current setting of the #VRN command as an ASCII decimal
value in result code format.
PRELIMINARY
AT Commands
155
#VRX (Voice Receive) Voice Commands
Command Syntax
AT#VRX
Description
Used when a voice file is received from the line, microphone, or handset. The
#VLS command should have been previously issued to select the input
source.
Arguments
None
Aborting Events
None
156
PRELIMINARY
Voice Commands
#VSD (Enable Silence Deletion)
Command Syntax
AT#VSD = <argument>
Description
Enables or disables silence deletion in the voice receive mode
Arguments
0 or 1
0
Turns off the silence deletion (default).
1
Turns on the silence deletion if the silence sensitivity setting #VSS is nonzero. The aggressiveness of the silence deletion is controlled by #VSS.
Aborting Events
None
Other
#VSD? returns the current setting of the #VSD command as an ASCII decimal
value in result code format.
PRELIMINARY
AT Commands
157
#VSK (Buffer Skid Setting) Voice Commands
Command Syntax
AT#VSK<argument>
Description
Sets the number of bytes of spare space in the modem’s buffer during voice
transmit mode after the XOFF threshold is reached. This equates to the skid
spare buffer space. This is the amount of data the DTE can continue to send,
after being told to stop sending data by the modem, before the modem voice
transmit buffer overflows.
Arguments
0–255
Defines the unused bytes remaining in the modem voice transmit buffer after
an XOFF is sent to the DTE (default = 255)
Aborting Events
None
Other
#VSK? returns the current setting of the #VSK command as an ASCII decimal
value in result code format.
158
PRELIMINARY
Voice Commands
#VSM (Select Compression Method)
Command Syntax
AT#VSM = <cmi>,<vsr>
Description
Selects the method of compression. The sampling rate is set at 8000 and cannot be changed.
Arguments
cmi, vsr
cmi 128 GSM (default)
129 G.721 ADPCM
130 IMAADPCM
vsr 8000
PRELIMINARY
AT Commands
159
#VSP (Silence Detection Period) Voice Commands
Command Syntax
AT#VSP = <argument>
Description
Sets the voice receive mode silence detection period (inactivity timer) value
of the inactivity timer in voice receive mode. The parameter, in units of 100 ms,
can be used when receiving voice data. This is the amount of time, which if
elapsed without receiving any ADPCM data, causes the modem to send the
<DLE>s or <DLE>q codes after ensuring that the buffer is empty. There are
two cases:
1) With the modem’s silence deletion feature enabled, the #VSP setting is in
effect an inactivity timer. The modem must reset this timer on every byte
of voice data received.
2) With the modem’s silence deletion feature disabled, the modem determines what constitutes silence. This involves monitoring and debouncing
the modem value for average energy. If this debounced value is less than
an arbitrary threshold constituting the modem’s definition of silence for a
period greater than that defined by the #VSP setting, the modem sends
the <DLE>q or <DLE>s shielded code to the DTE.
Arguments
0–255
0
Turns off the silence period detection timer
1– 255 Defines the period without received voice data in 100 ms units
(default = 55)
Aborting Events
None
Other
#VSP? returns the current setting of the #VSP command as an ASCII decimal
value in result code format.
160
PRELIMINARY
Voice Commands
#VSR (Sampling Rate Selection)
Command Syntax
AT#VSR = <argument>
Description
Determines the necessary DTE interface speed, along with the #VBS (bits per
sample command), to transmit and receive in the voice mode
Arguments
8000 (Default)
Aborting Events
None
Other
#VSR? returns the current setting of the #VSR command as an ASCII decimal
value in result code format.
PRELIMINARY
AT Commands
161
#VSS (Silence Detection Tuner)
Voice Commands
Command Syntax
AT#VSS = <argument>
Description
Enables or disables silence detection in voice receive mode and controls the
sensitivity employed by the modem in compressing periods of silence.
Arguments
0–3
0
Disables silence detection by the modem when in voice receive mode
1
Low sensitivity setting. When this command is received by the modem,
the system is configured to the state that is least likely to detect and compress periods of silence. It is still able to do so if the line is very quiet.
2
Midrange sensitivity setting. When this command is received by the modem, the system is configured to a state which is likely to be the best overall compromise on normal telephone lines (default).
3
High sensitivity setting. When this command is received by the modem,
the system is configured to the state that is most likely to detect and compress periods of silence.
Aborting Events
None
Other
#VSS? returns the current setting of the #VSS command as an ASCII decimal
value in result code format.
162
PRELIMINARY
Voice Commands
#VTD (DTMF Tone Reporting)
Command Syntax
AT#VTD = <argument>
Description
Queries and controls which types of tones can be detected and reported to the
DTE via shielded codes in voice transmit, voice receive, and online voice command modes.
Arguments
i, j, k, or ?
i, j, k Corresponds (in ASCII hexadecimal) to the desired capabilities for voice
transmit, voice receive, and online voice command modes, respectively.
The possible values for each bit are shown in Table 1–31.
?
Returns the tone reporting capabilities of the modem.
Table 1–31. #VTD Tone Detection/Reporting Bit Settings
Bit
0
Description
0 = Disable DTMF tone capability
1 = Enable DTMF tone capability
1
0 = Disable V.25 1300-Hz calling tone capability
1 = Enable V.25 1300-Hz calling tone capability
2
0 = Disable T.30 1100-Hz facsimile calling tone capability
1 = Enable T.30 1100-Hz facsimile calling tone capability
3
0 = Disable V.25/T.30 2100-Hz answer tone capability
1 = Enable V.25/T.30 2100-Hz answer tone capability
4
0 = Disable Bell 2225-Hz answer tone capability
1 = Enable Bell 2225-Hz answer tone capability
5
0 = Disable call progress tone and cadence (for example, busy and dial
tone) capability
1 = Enable call progress tone and cadence (for example, busy and dial
tone) capability
6–7
Reserved
Aborting Events
None
Other
#VTD? Returns the current setting of the #VTD command as an ASCII decimal value in result code format.
PRELIMINARY
AT Commands
163
#VTS (Generate Tone Signals) Voice Commands
Command Syntax
AT#VTS
Description
Can be issued to play one or more DTMF or other tones (such as a beep) if
the modem is in the online voice command mode. The modem parses and
plays the tones defined in the parameter in the order listed, and no key abort
is accepted. The parameter can have three types of elements separated by
commas: dual or single tones, and varying DTMF digits. The dual or singles
tones are represented by a substring enclosed in square brackets [ ], within
the parameter. Each such substring consists of three subelements corresponding to two frequencies in hertz (0, or 200–3000) and a duration (ASCII
decimal in units of 100 ms). The varying DTMF digits are represented by a substring enclosed in curly braces { }, within the parameter. Each such substring
consists of two sub-elements corresponding to a DTMF digits (0–9,A–D,*,#),
and alternate durations in units of 100 ms.
Arguments
None
Example
AT#VTS=1, 2, [1100, 1300, 50], {*, 6}, [800, 1300, 50], 9
The perform this operation, do the following:
1) Play the DTMF 1 tone at the default duration set by #VTD.
2) Play the DTMF 2 tone at the default duration set by #VTD.
3) Play the discrete tones at 1100 Hz and 1300 Hz at 500 ms duration.
4) Play the DTMF * tone at the default duration set by #VTD.
5) Play the discrete tones at 800 Hz and 1300 Hz at 500 ms.
6) Play the DTMF 9 tone at the default duration set by #VTD.
164
PRELIMINARY
Voice Commands
#VTX (Voice Transmit)
Command Syntax
AT#VTX
Description
Switches to voice transmit mode. This command can be issued only if the modem is in the online voice command mode (indicated previously with the VCON
message).
Arguments
None
Other
#VTX is used when a voice file is to be transmitted to the line, speaker, or handset. The #VLS command should have been previously issued to select the output source.
PRELIMINARY
AT Commands
165
Result Code for Voice Operation
1.12 Result Code for Voice Operation
The two result codes, VCON and CONNECT, are used as bridges whereby
voices operations can traverse back and forth as circumstances dictate.
1.12.1 VCON
VCON is sent:
- when the modem is configured for voice (#CLS=8)
- after answering or originating a call, the modem enters the online voice
command mode for the first time. Typically, this follows an off hook in answer mode and after ringback ceases in originate mode.
- When the DTE requests a switch from voice transmit mode to online voice
command mode by issuing a <DLE><ETX> to the modem.
- When the DTE requests a switch from voice receive mode to online voice
command mode via the key abort.
1.12.2 CONNECT
CONNECT is sent when switching from the online voice command mode to
either voice receive mode via the #VRX command or to voice transmit mode
via the #VTX command. This message informs the DTE that it may receive
or send compressed data.
166
PRELIMINARY
DSVD Commands
–SAD (Set the Number of Audio Packet Delay)
1.13 DSVD Commands
This section lists and defines the commands for modems with DSVD options.
Command Syntax
AT–SAD = <argument>
Description
Sets the number of audio packet delays
Arguments
0–3
(default = 3)
Other
–SAD=? returns a list of allowed values for –SAD.
–SAD? returns the current value of –SAD.
PRELIMINARY
AT Commands
167
–SAT (Select Audio Device) DSVD Commands
Command Syntax
AT–SAT = <argument>
Description
–SAT= selects the audio device
Arguments
0–2
168
0
Handset (default)
1
Headset
2
Microphone/speaker
PRELIMINARY
DSVD Commands
–SHG (Select Handset Input Gain)
Command Syntax
AT–SHG = <argument>
Description
Selects the handset gain. The default is 0. The other numbers increase the
gain over the default value.
Arguments
0–2
(default = 0)
PRELIMINARY
AT Commands
169
–SHV (Select Handset Volume)
DSVD Commands
Command Syntax
AT–SHV = <argument>
Description
Selects the handset volume. The default is 0. The other numbers represent an
increase over the default value.
Arguments
0–2
(default = 0)
170
PRELIMINARY
DSVD Commands
–SMG (Select Microphone Gain)
Command Syntax
AT–SMG = <argument>
Description
Selects the microphone gain. The default is 0. The other numbers represent
an increase in gain over the default value.
Arguments
0–2
(default = 0)
PRELIMINARY
AT Commands
171
–SPH? (Query Auxillary Phone Hook Status) DSVD Commands
Command Syntax
AT–SPH?
Description
Returns the auxiliary phone hook status: on hook or off hook.
172
PRELIMINARY
DSVD Commands
–SSA (Select Audio Compression Algorithm)
Command Syntax
AT–SSA = <argument>
Description
Selects the audio compression algorithm. Only TrueSpeecht is supported at
this time.
Arguments
1 TrueSpeech
PRELIMINARY
AT Commands
173
–SSE (Enables/Disables DSVD) DSVD Commands
Command Syntax
AT–SSE = <argument>
Description
Enables or disables the DSVD
Arguments
0 or 1
Other
174
0
DSVD disabled (default)
1
DSVD enabled
–SSE? returns the DSVD functionality status.
PRELIMINARY
DSVD Commands
–SSN(Enables/Disables Sequence Numbers)
Command Syntax
AT–SSN=<argument>
Description
–SSN= enables/disables the sequence numbers for audio packets.
Arguments
0 or 1
PRELIMINARY
0
Disabled
1
Enabled (default)
AT Commands
175
–SSV (Select Speaker Volume)
DSVD Commands
Command Syntax
AT–SSV = <argument>
Description
Selects the speaker volume. The default is 0. The other numbers increase the
volume over the default value.
Arguments
0–2
(default = 0)
176
PRELIMINARY
VoiceView Commands
+FCLASS (Mode Selection )
1.14 VoiceView Commands
This section discusses and defines the voice view commands which are
Command Syntax
AT+FCLASS = <argument>
Description
Selects the DCE service classes: data, fax, or VoiceView. (Others, such as
+FCLASS = 8, specified in IS–101, may also be supported but are not addressed here.) The service class may be set by the DTE from the choices available in the DCE. This parameter is mandatory.
A value of +FCLASS = 80 indicates the VoiceView operation as described
here. VoiceViewrecognizes a service class of 0 as the mandatory default operation if the mode is supported.
If +FCLASS = 0 is not supported, +FCLASS = 80 is the default. The default
service class is set in response to the ATZ reset command. Service classes
1 and 2.0 specify fax service classes. VoiceView DCE may support any or all
of other standard +FCLASS modes of operation. The mode of operation may
be explicitly changed via this command or other commands issued by the DTE.
Arguments
PRELIMINARY
0, 1, 2.0, or 80
0
Data service class (default if supported)
1
Fax service class 1
2.0
Fax service class 2.0
80
VoiceView service class (default if +FCLASS not supported)
AT Commands
177
+FLO (Flow Control) VoiceView Commands
Command Syntax
AT+FLO = <value>
Description
Allows the DTE to identify and select the types of flow control provided and
used. Support of in-band bidirectional DC1/DC3 (XON/XOFF) flow control is
mandatory; flow control using V.24 circuits 106 and 133 is optional. A setting
of 0 is provided for configurations where no flow control is necessary or flow
control is provided by other means. A setting of 1, the default, means that XON/
XOFF can be used in either direction. A setting of 2 means that CCITT circuit
133 is used for flow control of the DCE by the DTE and circuit 106 for flow control of the DTE by the DCE.
Arguments
0–2
178
0
No flow control or manufacturer specific control
1
XON/XOFF flow control may be used (default)
2
CCITT circuits 133 and 106 may be used for flow control
PRELIMINARY
VoiceView Commands
+FMI? (Identify DCE Manufacturer)
Command Syntax
AT+FMI?
Description
Reports the manufacturer’s identification information. Typically, the text consists of the name of the manufacturer, but the manufacturer may choose to
provide more information. The maximum text length is 80 characters. The first
eight characters must be unique.
PRELIMINARY
AT Commands
179
+FMM? (Identify DCE Model) VoiceView Commands
Command Syntax
AT+FMM?
Description
Reports the product identification information. Typically, the text consists of the
name of the product, but the manufacturer may choose to provide more information. The maximum text length is 80 characters. The first eight characters
must be unique.
180
PRELIMINARY
VoiceView Commands
+FMR? (Identify DCE Revision)
Command Syntax
AT+FMR?
Description
Reports the version, revision level, or other pertinent information for the device. Typically, the text consists of the version of the product, but the manufacturer may choose to provide more information. The maximum text length is 80
characters. The first eight characters must be unique.
PRELIMINARY
AT Commands
181
+FPR (Select DTE/DCE Interface Rate) VoiceView Commands
Command Syntax
AT+FPR = <argument>
Description
Allows the DTE to select among various fixed DTE/DCE interface rates and
autobaud. The selected rate stays in effect until the DTE selects another rate.
The selected rate takes effect after the DCE returns the OK result code. The
default setting of the parameter +FCLASS = 80 is 4.
VoiceView DCE supports autobaud and baud rates greater than or equal to
9600 bps alike at a value of +FCLASS=80. Therefore, values 1, 2, and 3 should
not be used, since they produce an ERROR result code if the DTE issues one
of these settings while the value of +FCLASS=80.
Arguments
182
0–8
(default = 4)
The fixed DTE/DCE interface rate equals the argument times 2400.
PRELIMINARY
VoiceView Commands
–SCD (Capabilities Data)
Command Syntax
AT–SCD = <string of hexadecimal octets>
Description
Allows the DTE to read or alter information stored in the DCE. The DCE contains information about its supported capabilities, which are used on powerup
and when executing an –SIP reset or an –SIC initialize capabilities command.
Using –SCD, the DTE can change the information that the DCE sends when
responding to a capabilities query. The argument of this command is an octet
string consists of pairs of hex numbers. Spaces between octets are ignored
by the DCE. The DCE converts each hex pair into a binary octet and stores
it in its capabilities information storage area. The DCE constructs the capabilities message from the octets in the order in which they have been received and
stored.
The parameter may require up to 508 hex characters to specify the capabilities
information. Since only 40 characters can be transmitted in each command,
this command may be repeated with new data; each use appends data to the
data that is currently stored in the DCE.
The DTE can completely specify the DCE’s capabilities information by first issuing an AT–SCD = ”” command (null string) to erase all capability information
and then sending one or more AT–SCD = ”string” commands containing the
desired information.
The DCE response for the AT–SCD = ? command is the number of bytes that
the DCE can hold for capabilities information.
Using the AT–SCD? parameter read command, the DTE can read the list of
current DCE capabilities. Each octet of the capabilities information is represented by a pair of hex numbers separated by spaces. All capabilities octets
are returned in a single response. If the DTE wishes to determine the inherent
capabilities of the DCE, it issues the AT–SIC initialize capabilities command
or the AT–SIP reset command and then reads the capabilities data (AT–
SCD?). An example response to the DTE for issuing AT–SCD? for VoiceView
DCE which has VoiceView data mode, no message storage, a DTE interface,
and fax data mode enabled is:
<CR><LF>05 03 44 01 02<CR><LF>
Arguments
0 – 254 hexadecimal octets
Other
–SCD=? returns the number of bytes that can be held in the DCE for the
capabilities information.
–SCD? returns a list of the current DCE capabilities.
PRELIMINARY
AT Commands
183
–SDA (Originate Action Control) VoiceView Commands
Command Syntax
AT–SDA = <argument>
Description
Causes the DCE to perform the dial function specified in TIA/EIA–602 when
the ATD or ATO commands are issued with the default argument. All of the
ATD command modifiers are supported as specified in TIA/EIA–602. This behavior is true across all the service classes.
Setting AT–SDA = 1 causes the DCE to interpret the ATD and ATO commands
slightly differently. In this mode. when the DCE receives an originate call command such as an ATD or ATO, it sends the appropriate data mode start sequence. The interpretation depends on the current +FCLASS setting. If
+FCLASS = 0, a modem data mode start sequence is started in response to
the ATD and ATO originate commands. If +FCLASS = 1 or 2.0, the fax data
mode start sequence is started in response to the ATD originate command. If
+FCLASS = 80, the VoiceView data mode start sequence is started in response to the ATD and ATO originate commands.
When the DCE receives an AT–SDA = 1 command, it starts a 120-second timer. The DCE automatically resets the –SDA parameter to 0 after either receiving and executing an originate call command (ATD or ATO) or upon the timer
expiring, whichever happens first.
Arguments
184
0 or 1
0
DCE dials outgoing call (default)
1
DCE originates data mode start sequence
PRELIMINARY
VoiceView Commands
–SDR (Modem Data Mode Response Control)
Command Syntax
AT–SDR = <argument>
Description
The DTE sets –SDR = 0, the default setting, to have the DCE reject data mode
start sequences. The DTE sets –SDR = 1 to have the DCE report incoming
data mode start sequences to the DTE with either the RING event message
or the –SSD event message and wait for the DTE to respond. Regardless of
the setting of –SDR, the DCE reports the RING event message in the data service class and the –SSD event message in the nondata service classes, if the
–SEV event suppression parameter is set to allow event message reporting.
Arguments
0 or 1
PRELIMINARY
0
Reject incoming modem data mode start sequences (default)
1
Wait for DTE response to incoming modem data mode start sequences
AT Commands
185
–SDT (Date) VoiceView Commands
Command Syntax
AT–SDT = <argument>
Description
Sets the DCE date in the format yymmdd where: yy is a 2-digit year with a value
from 00 to 99; mm is a 2-digit month with a value from 01 to 12; and dd is a
2-digit day with value from 01 to the number of days in the particular month
specified by mm. If a correct value for the date is entered, the DCE date is
changed and an OK result code is returned. If an erroneous date is entered,
the ERROR code is returned and the date in the DCE is unchanged. This command is mandatory for the optional message storage system.
Arguments
yymmdd
186
yy
=
00 to 99
mm
=
01 to 12
dd
=
01 to 31
PRELIMINARY
VoiceView Commands
–SEM (Erase Message)
Command Syntax
AT–SEM
Description
Erases the oldest message residing in the DCE. This command is valid only
when the value of +FCLASS = 80. This command usually follows the successful retrieval of a message from the DCE message storage system. The ERROR message is issued immediately if the message storage system is empty.
The DCE issues the OK response once the message has been deleted.
PRELIMINARY
AT Commands
187
–SER? (Error Status) VoiceView Commands
Command Syntax
AT–SER?
Description
Solicits an error report from the DCE. The –SER error parameter is read only.
The response from the DCE is a hexadecimal representation of the –SER error
parameter byte with values in the range from 21h–9FH. The three most significant bits of this byte are used to identify what type of error occurred. Bit 8 set
indicates a general error, (see Table 1–32). Bit 7 set means that the error occurred in the link layer (See Table 1–33). Bit 6 set means that a time-out has
occurred (see Table 1–34) The error code is valid until a request to send data
command is issued, a start sequence is received from the telephone network
interface, or an –SIP reset command is issued.
Table 1–32. General Error Codes
Code
Error
81h
Unrecognized command issued by the DTE
82h
Unsupported parameter received (<value>, <compound value>)
83h
Could not initiate data mode (for example, switchhook = on hook)
84h
Invalid capabilities information issued by DTE
Table 1–33. Link Layer Error Codes
Code
Error
41h
Invalid HDLC frame received
42h
DISC received as response
43h
Maximum number of retransmissions exceeded; unable to successfully
send data
Table 1–34. Timing Error Codes
Code
188
Time-Out Error
21h
Time-out waiting for a valid mode tone in the start sequence
22h
Time-out waiting for data modulation to begin after start sequence
23h
Time-out waiting for a valid data frame (T203 expired)
24h
Time-out waiting for a transaction in auto-answer state (T100 expired)
25h
Time-out waiting for a response to a capabilities query
26h
Time-out waiting for a response to a capabilities exchange request
27h
Time-out waiting for a DTE response to an incoming data-mode start
sequence event (–SSV, –SSD, –SSF, RING)
PRELIMINARY
VoiceView Commands
–SEV (Event Message Suppression)
Command Syntax
AT–SEV = <argument>
Description
Enables or disables event message suppression. Suppressing start sequence
event messages (–SSV, –SSD, –SSF) forces the DCE to reject incoming start
sequences that do not match the current class of service. The –SIP reset command, and/or the ATZ reset command, initialize this parameter to its default
setting.
Arguments
0 or 1
PRELIMINARY
0
DCE issues event messages
1
DCE suppresses event messages (default)
AT Commands
189
–SFR (Fax or Data Mode Response Control) VoiceView Commands
Command Syntax
AT–SFR = <argument>
Description
The DTE sets –SFR=0, the default setting, so that the DCE can reject fax or
data-mode start sequences.
The DTE sets –SFR=1 so that the DCE can report incoming fax or data mode
start sequences to the DTE. The DCE can report with either the RING event
message or the –SSF event message and wait for the DTE to respond.
Regardless of the setting of –SFR, the DCE reports the RING event message
in the fax service class and the –SSF event message in the nonfax service
classes (if the –SEV event suppression parameter is set to allow event message reporting).
Arguments
190
0 or 1
0
Reject incoming fax data mode start sequences (default)
1
Wait for DTE response to incoming fax or data mode start sequences
PRELIMINARY
VoiceView Commands
–SIC (Reset Capabilities Data to Default Setting)
Command Syntax
AT–SIC
Description
The DTE issues this command to have the DCE initialize the capabilities data
to the capabilities of the DCE. The DCE also sets the –SVR, –SDR, –SFR response parameters to reflect the capabilities of the DCE. The DCE issues the
OK result code when all the capabilities parameters have been reset to the
DCE defaults. The –SIC command is valid only if +FCLASS = 80.
PRELIMINARY
AT Commands
191
–SIP (Initialize VoiceView Parameters) VoiceView Commands
Command Syntax
AT–SIP = <argument>
Description
Initializes the VoiceView parameters. This command is valid only if the value
of +FCLASS = 80. Refer to a specific parameter description to determine what
the default is for that parameter. The DCE issues the OK result code when all
parameters have been reset to their defaults and the optional message storage system (if present) has been audited or deleted.
Arguments
0–2
192
0
DCE resets VoiceView parameters to their defaults (default)
1
DCE resets VoiceView parameters to their defaults and audits the message storage system
2
DCE resets VoiceView parameters to their defaults and erases the message storage system
PRELIMINARY
VoiceView Commands
–SKA (Keep Alive Timer)
Command Syntax
AT–SKA=<argument>
Description
Defines the period during which the keep-alive character (<ACK>) is transmitted to the DTE during VoiceView data transfers. The <ACK> character is
transmitted even if the DTE is controlled by flow (XOFF). The DCE issues the
<ACK> character to inform the DTE that the transaction is progressing correctly. This period value is measured in seconds. A value of 0 means that this parameter is disabled. This command also defines the period for the <CAN>
character and the –SVM VoiceView ‘message is present’ message. The DCE
issues the <CAN> character to the DTE to have the DTE immediately terminate the data transaction. The DCE issues the –SVM message when the DCE
has a message in its storage system for the DTE to retrieve.
Arguments
0 – 255 seconds
(default = 5)
PRELIMINARY
AT Commands
193
–SMT (Telephone Handset Mute Control) VoiceView Commands
Command Syntax
AT–SMT<argument>
Description
The telephone automatically mutes during the data modes initiated with the
VoiceView start sequence. The DCE issues the OK response once the local
telephone interface is in the desired state. AT–SMT is valid only when the value of +FCLASS=80.
Arguments
0 or 1
194
0
DCE unmutes the local telephone interface (default)
1
DCE mutes the local telephone interface
PRELIMINARY
VoiceView Commands
–SOR (Reject or Overflow System Messages)
Command Syntax
AT–SOR = <argument>
Description
Defines whether the DCE rejects or overflows the message buffers of the optional message storage system. If the DCE implements the message storage
system option, it may run out of memory while receiving data and need to overflow the system (make room) or reject the receiving data. If this parameter is
0 (default), any data received when the DCE is full is rejected with a DISC link
layer message. If this parameter is 1, the DCE erases one or more of the oldest
messages in the message storage system to ensure enough storage for the
new message. It continues to erase the oldest messages in the message storage system until no more room is needed.
Arguments
0 or 1
PRELIMINARY
0
Reject incoming VoiceView data on overflow (default)
1
Overflow incoming VoiceView data on overflow
AT Commands
195
–SQR (Capabilities Query Response Control) VoiceView Commands
Command Syntax
AT–SQR = <argument>
Description
The DTE sets –SQR = 1 to have the DCE request (polled response) an originating DCE’s capability information when it transmits its own capabilities information in response to a capabilities query.
If the DTE sets –SQR = 0, the DCE does not request the capability information
from the originating DCE. The DCE behaves as if this parameter is set to 0
when the capabilities query is received in non-VoiceView service classes. Additionally, the DTE is not able to receive the capabilities data in those service
classes.
The DCE always responds to a capabilities query with a capabilities response
message regardless of the setting of the –SQR query response parameter or
the service class +FCLASS.
Arguments
196
0 or 1
0
Provide one-way response to capabilities query (default)
1
Request two-way response to capabilities query
PRELIMINARY
VoiceView Commands
–SRG (Ring Generator Count)
Command Syntax
AT–SRG = <argument>
Description
The DTE sets –SRG= to the maximum number of RING event messages generated by the DCE when the DCE detects a modem data mode start sequence
with a value of +FCLASS = 0, or a fax data mode start sequence with a value
of +FCLASS = 1 or 2.0. The RING event message is issued by the DCE every
six seconds until either the DTE responds or the maximum ring count is
reached. If the maximum ring count is reached, the DCE returns to voice mode.
The default number of RING event messages is 3.
Arguments
0 – 255
(default = 3)
PRELIMINARY
AT Commands
197
–SRJ (Reject Data Mode Request) VoiceView Commands
Command Syntax
AT–SRJ
Description
The DTE issues –SRJ so that the DCE can reject the remote data mode request. This command is issued by the DTE in response to the RING, –SSD,
–SSF, –SSV event messages. The DCE issues the OK response once the data
mode request has been rejected and the DCE has returned to voice mode.
198
PRELIMINARY
VoiceView Commands
–SRM (Retrieve Message)
Command Syntax
AT–SRM
Description
Retrieves the oldest message residing in the message storage system of the
DCE. This command is valid only when the value of +FCLASS=80. The DCE
immediately issues the ERROR message if the message storage system is
empty when a message is present. The DCE returns the message data. This
data may be terminated in three ways:
- The <DLE><EOT> characters followed by the OK response are positive
ends of message marker.
- The <DLE><CAN> characters followed by the OK response are end-of-
message markers that indicate the far-end aborted the data transmission.
- The <DLE><CAN> characters followed by the ERROR response are end-
of-message markers that indicate that the local DCE detected an error in
the data reception.
PRELIMINARY
AT Commands
199
–SSP (Set VoiceView Transmission Speeds) VoiceView Commands
Command Syntax
AT–SSP = <argument>
Description
Allows the DTE to specify the data modulation schemes that are associated
with the VoiceView mode tones. The <argument> is comprised of three fields.
The first field represents the VoiceView burst speed. The second field represents the VoiceView recovery speed. The third field represents the VoiceView
priority speed. The default settings for these fields are 0, 1, and 2, respectively.
Other modulation schemes and transmission speeds are reserved.
Arguments
0–5
200
0
V.21 300bps FSK (frequency shift keying)
1
V.27ter 4800 DPSK (differential phase shift keying)
2
V.29 9600bps QAM (quadrature amplitude modulation)
3
V.29 4800bps QAM (quadrature amplitude modulation)
4
V.17 7200bps TCM (trellis code modulation)
5
V.17 14400bps TCM (trellis code modulation)
PRELIMINARY
VoiceView Commands
–SSQ (Start Capabilities Query)
Command Syntax
AT–SSQ
Description
Initiates the transmission of the capabilities query start sequence. This command is valid only when the value of +FCLASS = 80. The DCE issues the ERROR response if this command is issued in a service class other than
+FCLASS = 80. The DCE issues the OK response once the DCE has completed the query and returned to voice mode.
PRELIMINARY
AT Commands
201
–STM (Time)
VoiceView Commands
Command Syntax
AT–STM = <hhmm>
Description
Sets the DCE time. The parameter hh is a 2-digit hour that can have any value
from 00 to 23 where 00 represents 12:00 midnight and 23 represents 11:00
PM. The mm parameter is a two-digit minute that can have any value from 00
to 59. If a correct value for the time is entered, the DCE time is changed and
an OK result code is returned. If an erroneous time is entered, the DCE time
is not changed and an ERROR result code is returned. This command is mandatory for the optional message-storage system.
Arguments
hhmm
202
hh
=
00 to 23
mm
=
00 yo 59
PRELIMINARY
VoiceView Commands
–STT (Telephone Handset Transaction Tone)
Command Syntax
AT–STT = <argument>
Description
Defines whether or not the DCE plays the transaction tone to the telephone
handset while data is being transmitted between the DCEs. If the setting is 1
(default), then the tone is played during the data transaction. If the setting is
0, then the tone is not played during the transaction.
Arguments
0 or 1
PRELIMINARY
0
Disables the handset tone during data transfer
1
Enables the handset tone during data transfer (default)
AT Commands
203
–SVR (VoiceView Data Mode Response) VoiceView Commands
Command Syntax
AT–SVR = <argument>
Description
Rejects VoiceView data-mode start sequences when AT–SVR = 0 . The DTE
sets –SVR = 1 to have the DCE report incoming VoiceView data mode start
sequences to the DTE. This is done with either the RING event message or
the –SSV event message. Regardless of the setting of –SVR, the DCE reports
the RING event message in the VoiceView service class and the –SSV event
message in the non-VoiceView service classes. This is, of course, if the –SEV
event suppression parameter is set to allow event message reporting.
Arguments
0 or 1
204
0
Reject incoming VoiceView start sequences (default)
1
Wait for DTE response to incoming VoiceView start sequences
PRELIMINARY
Event Message
1.15 Event Message
Event messages are used by several processes for communicating their status to the DTE. The following sections detail event messages and what notification they provide to the DTE.
1.15.1 VoiceView Data-Mode Event Message
Read Syntax: –SSV
The VoiceView data mode event message notifies the DTE when a VoiceView
data-mode start sequence is received by the DCE. If the DCE is not in the VoiceView service class, the DTE responds to the –SSV event message with either the +FCLASS = 80;A command line, or the –SRJ reject command. This
message can be suppressed by setting the –SEV event suppression parameter. If the –SSV message is suppressed, then incoming VoiceView data-mode
start sequences that are detected when the modem is in a non-VoiceView service class are rejected.
1.15.2 Modem Data Mode Event Message
Read Syntax: –SSD
The modem data-mode event message notifies the DTE when a modem datamode start sequence is received by the DCE. If the DCE is not in the data service class, the DTE responds to the –SSD event message with either the
+FCLASS=0;A command line or the –SRJ reject command. This message
can be suppressed by setting the –SEV event suppression parameter. If the
–SSD message is suppressed, then incoming modem data-mode start sequences that are detected in non-data service class are rejected.
1.15.3 Fax Data Mode Event Message
Read Syntax: –SSF
The fax data-mode event message notifies the DTE when a fax data mode
start sequence is received by the DCE. If the DCE is not in a fax service class,
the DTE is expected to responds to the –SSF event message with either the
+FCLASS=1 or 2.0;A command line or the AT–SRJ reject command. This
message can be suppressed by setting the –SEV event suppression parameter. If the –SSF message is suppressed, then incoming fax data mode start
sequences that are detected in a nonfax service class are rejected.
PRELIMINARY
AT Commands
205
Event Message
1.15.4 ADSI Response Message
Read Syntax: –SRA
The ADSI response message notifies the DTE when the DCE has received
the DTMF A tone response to a capabilities query. The answering DCE is an
ADSI CPE device. This message can be suppressed by setting the –SEV
event-suppression parameter.
1.15.5 Capabilities Query Event Message
Read Syntax: –SRQ
The DCE issues the capabilities query event message to notify the DTE when
a capabilities query or a two-way capabilities exchange request has been received by the DCE. This message can be suppressed by setting the –SEV
event-suppression parameter.
Suppressing this message does not prevent the DCE from transmitting its capabilities; it does prevent the DCE from requesting an exchange of capabilities, if so configured.
If a two-way capabilities exchange request is received in response to a capabilities query, the –SRQ event report is reported to the DTE following the –
SRC:<capabilities octets> message.
1.15.6 Capabilities Response
Read Syntax: –SRC:<capabilities octets>
This event message reports the capabilities information received from the faxend DCE to the DTE. Octets of the capabilities information consist of pairs of
hex numbers separated by spaces. All capabilities octets are returned in a
single response.
1.15.7 Talk Off Event Message
Read Syntax: –STO
The DCE issues the talk off event message when the DCE detects the VoiceView start tone but not the flag sequence or the ADSI CAS tone. This message
is for information, and may be used by the DTE. This message can be suppressed by setting the –SEV event suppression parameter.
206
PRELIMINARY
Event Messages
1.15.8 VoiceView Message Present Event Message
Read Syntax: –SVM
The DCE issues a VoiceView message indicating that there is a message
present when the DCE has correctly received the first frame in its message
storage system. The DCE issues the –SVM message periodically until the
DTE deletes all messages with the –SEM erase message command. The period of the –SVM message is defined by the –SKA keep-alive timer. The DCE
issues the –SVM message as long as it has at least one message in its message storage system.
PRELIMINARY
AT Commands
207
$ (Basic) Help Commands
1.16 Help Commands
This section lists the commands that will take you to specific help screens
when you need assistance with the AT commands.
Command Syntax
AT$
Description
Displays a help screen to the DTE describing each of the AT single-letter commands:
&$
A/
AT
A
B
D
DL
DSn
D$
En
Fn
Hn
In
Ln
Mn
On
P
Qn
Sr=n
Sr?
S$
T
Vn
Xn
Yn
Zn
+++
$
Arguments
None
Aborting Events
Entering < Ctrl >C interrupts the command. Entering < Ctrl >S stops the command and interrupts the display. Entering < Ctrl >S or < any key > from the DTE
restarts the display.
208
PRELIMINARY
Help Commands
&$ (Extended Ampersand)
Command Syntax
AT&$
Description
Displays a help screen to the DTE describing each of the extended commands.
&A
&B
&C
&D
&F
&G
&H
&I
&K
&M
&N
&P
&R
&S
&T
&Y
&W
&Zn=s
&Zn?
Arguments
None
Aborting Events
Entering < Ctrl >C or < Ctrl >K from the DTE interrupts the command. Entering
< Ctrl >S from the DTE interrupts the display. Entering < Ctrl >S or < any key >
from the DTE restarts the display.
PRELIMINARY
AT Commands
209
D$ (Dial) Help Commands
Command Syntax
ATD$
Description
Displays a help screen to the DTE describing each of the dial commands.
-
Digits used in dial string
Auxiliary touch-tone-pad digits
Tone-dialing command
Pulse-dialing command
Reverse frequencies
Pause
Return-to-command mode
Quote mode
Wait-for-second dial tone
Wait for answer
Flash switchhook
Arguments
None
Aborting Events
Entering < Ctrl >C or < Ctrl >K from the DTE interrupts this command. Entering
< Ctrl >S from the DTE interrupts the display. Entering < Ctrl >S or < any key >
from the DTE restarts the display.
210
PRELIMINARY
Help Commands
Sn? (S Register Contents)
Command Syntax
ATSn?
Description
Displays the contents of a command or S register when a ? character is entered after the command character or S register name.
Arguments
None
Aborting Events
None
PRELIMINARY
AT Commands
211
S$ (S Register Decription) Help Commands
Command Syntax
ATS$
Description
Displays a help screen to the DTE describing each of the following S registers:
S0–S13, S15, S16, S18, S19, S21–S23, S25, S27–S34, and S38.
The remaining registers are reserved and are not described in a help screen.
Arguments
None
Aborting Events
Entering < Ctrl >C interrupts the command. Entering < Ctrl >S holds the command. Entering < Ctrl >S or < any key > restarts the command.
212
PRELIMINARY
IMPORTANT NOTICE
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TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
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In order to minimize risks associated with the customer’s applications, adequate design and operating
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TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
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Copyright  1998, Texas Instruments Incorporated
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